SUSE-SU-2026:23360-1
Vulnerability from csaf_suse - Published: 2026-08-26 14:27 - Updated: 2026-09-16 20:14Summary
Security update for unbound
Severity
Important
Notes
Title of the patch: Security update for unbound
Description of the patch: This update for unbound fixes the following issues:
Update to version 1.25.2.
Security issues fixed:
- CVE-2026-14586: DoS via assertion in `libngtcp2` for DNS-over-QUIC environments with high concurrency (bsc#1271879).
- CVE-2026-32665: Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass (bsc#1271873).
- CVE-2026-40691: DoS due to heap overflow via single bad DNSCrypt query over TCP (bsc#1271875).
- CVE-2026-41637: Degradation of resolution service due to improperly accounted client-terminated DNS-over-QUIC queries
(bsc#1271891).
- CVE-2026-42955: Ghost domain window can be extended by up to one cached TTL configured value for A/AAAA glue records
(bsc#1271892).
- CVE-2026-44621: Libunbound applications configured with `unwanted-reply-threshold` could eventually be abruptly
terminated (bsc#1271876).
- CVE-2026-44687: Off-by-one error in `harden-below-nxdomain` logic can shadow a stub/forward zone by a legitimate
parent's `NXDOMAIN` (bsc#1271893).
- CVE-2026-44690: Cross-zone wildcard cache poisoning via `RRSIG.labels` manipulation (bsc#1271877).
- CVE-2026-46582: Replay of a wildcard `rrset` as another piece of data triggers poisoning in the server expired reply
path (bsc#1271894).
- CVE-2026-50045: `max-global-quota` bypass via single client queries for a deeply nested name under a DNSSEC-signed
parent (bsc#1271878).
- CVE-2026-50046: Possible heap use-after-free in an error path when a DoT forwarded query is jostled out (bsc#1271882).
- CVE-2026-50243: `response-ip`/`rpz` can rewrite BOGUS answers instead of returning SERVFAIL (bsc#1271880).
- CVE-2026-50248: BOGUS configured primary hostname accepted for XFR in auth/rpz zones (bsc#1271881).
- CVE-2026-50251: Attacker supplied `0.0.0.0`/`::` glue triggers defensive full-cache flush (bsc#1271883).
- CVE-2026-50252: Possible cache poisoning attack by mapping source port population per thread (bsc#1271884).
- CVE-2026-54478: DNS Cookie bypass when proxy-protocol with with `answer-cookie:yes` is used (bsc#1271895).
- CVE-2026-55708: Privacy/configuration issue when adding local data in views through `unbound-control` (bsc#1271896).
- CVE-2026-55717: `serve-expired-client-timeout` and `response-ip` CNAME redirect could lead to a crash (bsc#1271886).
- CVE-2026-55990: Crash via crafted client UDP query due to DNSCrypt faulty configuration (bsc#1271887).
- CVE-2026-55991: Remote DNS-over-QUIC (DoQ) flow-control reacheable assertion failure in `libngtcp2` (bsc#1271888).
- CVE-2026-56416: Possible heap buffer overflow when validator canonicalizes RDATA that contains domain name
(bsc#1271889).
- CVE-2026-56444: Degradation of resolution service when `discard-timeout` and `serve-expired-client-timeout` are
combined in unusual configuration (bsc#1271890).
Other updates and bugfixes:
- Version 1.25.2:
* For a complete list of additional changes see the changelog at https://nlnetlabs.nl/projects/unbound/download/.
- Update `unbound.keyring`.
Patchnames: SUSE-SLE-Micro-6.0-864
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
5.9 (Medium)
Affected products
Recommended
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
7.5 (High)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
important
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
7.5 (High)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
important
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
6.2 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
7.5 (High)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
important
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.6 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
6 products, the same list as for
CVE-2026-14586
Threats
Impact
moderate
References
96 references
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"text": "In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, in DNS-over-QUIC environments, with high concurrency and under pressure, an assertion in libngtcp2 about monotonic timestamps could trigger and result in server termination and thus denial of service. When interfacing with libngtcp2, for DNS-over-QUIC support in Unbound, it is expected to use monotonic time. Unbound was using realtime instead, and in DoQ environments with high concurrency and under pressure, an assert in libngtcp2 for the quic timestamp would trigger and terminate the server.This vulnerability needs Unbound to be compiled with DoQ support (\u0027--with-libngtcp2\u0027) and the \u0027quic-port\u0027 to be configured for the listening interfaces.",
"title": "CVE description"
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"text": "In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC (DoQ) is enabled, the first two bidirectional streams on a new QUIC connection (stream_id 0 and 4) bypass the per-stream \u0027quic-size\u0027 gate entirely, and large input buffers are allocated later, after only the 2-byte length prefix has been received from the initial streams. As a result, a remote client can make Unbound exceed the configured \u0027quic-size\u0027 limit with low-cost input. Using only one connection and two streams, each sending a declared 65535-byte length prefix and then holding the streams open, a client can already trivially make Unbound roughly allocate double that amount. This is a remote availability issue / memory-accounting bypass in the downstream DoQ implementation that leads to denial of service for new DoQ clients. This vulnerability needs Unbound to be compiled with DoQ support (\u0027--with-libngtcp2\u0027) and the \u0027quic-port\u0027 to be configured for the listening interfaces.",
"title": "CVE description"
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"text": "NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the \u0027ghost domain names\u0027 family of attacks that could extend the ghost domain window by up to one cached TTL configured value. Similar to other \u0027ghost domain names\u0027 attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client NS query can cause Unbound to overwrite the cached expired parent-side referral NS rrset with the child-side apex NS rrset and essentially extend the ghost domain window by up to one cached TTL configured value (\u0027cache-max-ttl\u0027). In configurations where \u0027harden-referral-path: yes\u0027 is used (non-default configuration), no client NS query is required since Unbound implicitly performs that query. Unbound 1.25.1 contains a patch with a fix that does not allow extension of TTLs for (parent) NS records regardless of their trust.",
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"text": "In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger than 65504 bytes is shifted forward by 48 bytes inside a buffer of capacity equal to \u0027msg-buffer-size\u0027, writing past the end of the heap allocation. A single malicious encrypted query crashes the resolver and lead to denial of service. This vulnerability needs Unbound to be compiled with DNSCrypt support (\u0027--enable-dnscrypt\u0027) and the \u0027dnscrypt:\u0027 clause to be configured and enabled for the listening interfaces.",
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"text": "In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, client terminated DNS-over-QUIC (DoQ) queries are not accounted properly by Unbound resulting in low-cost inflation of the waiting number of replies for already in-flight resolution queries. This results in degradation of resolution service for new clients for already in-flight queries. A malicious actor can exploit the vulnerability by issuing DoQ queries for query names that need resolution and proceeding on immediately terminating the query by one of STOP_SENDING/RESET_STREAM/CONNECTION_CLOSE QUIC frames. Those terminated DoQ queries are not properly counted for and keep inflating the number of waiting replies for in-flight queries. When the maximum is reached, it results in silent query drops for new clients needing resolution for already in-flight queries. This vulnerability needs Unbound to be compiled with DoQ support (\u0027--with-libngtcp2\u0027) and the \u0027quic-port\u0027 to be configured for the listening interfaces. Additionally, a malicious actor needs access to multiple source IPs to bypass the by-default configured \u0027wait-limit\u0027 option.",
"title": "CVE description"
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"title": "CVE-2026-41637"
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{
"cve": "CVE-2026-42955",
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"text": "https://www.suse.com/security/cve/CVE-2026-42955"
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{
"category": "general",
"text": "In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the \u0027ghost domain names\u0027 family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other \u0027ghost domain names\u0027 attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue rrset and essentially extend the ghost domain window by up to one cached TTL configured value (\u0027cache-max-ttl\u0027). In configurations where \u0027harden-referral-path: yes\u0027 is used (non-default configuration), no client query is required since Unbound implicitly performs that query. This is a variant of CVE-2026-40622 which only addressed the NS query.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-42955",
"url": "https://www.suse.com/security/cve/CVE-2026-42955"
},
{
"category": "external",
"summary": "SUSE Bug 1271892 for CVE-2026-42955",
"url": "https://bugzilla.suse.com/1271892"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-42955"
},
{
"cve": "CVE-2026-44621",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-44621"
}
],
"notes": [
{
"category": "general",
"text": "With NLnet Labs Unbound up to and including version 1.25.1, applications using libunbound and configured with \u0027unwanted-reply-threshold\u0027, could eventually be abruptly terminated if the threshold is reached and libunbound needs to call \u0027libworker_alloc_cleanup\u0027 since the function is absent from the function call allow list. When an application using libunbound sets \u0027unwanted-reply-threshold\u0027 to any non-zero value and the iterator queries an authoritative that replies with enough wrong-transaction-ID UDP datagrams to cross the threshold, the \u0027libworker_alloc_cleanup\u0027 will eventually be called. Since the function is absent from the function call allow list, this leads to a fatal exit of libunbound and eventual termination of the embedding application.Unbound itself is not affected since its relevant function \u0027worker_alloc_cleanup\u0027 is registed in the allow list and proceeds to perform the documented cache flush.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-44621",
"url": "https://www.suse.com/security/cve/CVE-2026-44621"
},
{
"category": "external",
"summary": "SUSE Bug 1271876 for CVE-2026-44621",
"url": "https://bugzilla.suse.com/1271876"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 6.2,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-44621"
},
{
"cve": "CVE-2026-44687",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-44687"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label\u0027s secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in \u0027harden-below-nxdomain\u0027 logic; enabled by default. It effectively bypasses the configuration and the configured stub/forward zone is never contacted. \u0027harden-below-nxdomain\u0027 does an upward DNS cache walk together with a delegation point guard that does not allow NXDOMAIN synthesis above stub/forward zones. The guard tests the domain name but before stripping a label. This results in an iteration where the domain name equals the configured stub/forward zone apex that passes the guard, strips one more label, and probes the cache at the apex\u0027s immediate public parent. If that parent has a cached DNSSEC-secure NXDOMAIN, which it will for any private namespace nested two or more labels under a signed public name, the walk returns it and the configured stub/forward upstream is never contacted. This can only be triggered by the query for the intermediate label (between the stub/forward apex and the DNSSEC parent zone).",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-44687",
"url": "https://www.suse.com/security/cve/CVE-2026-44687"
},
{
"category": "external",
"summary": "SUSE Bug 1271893 for CVE-2026-44687",
"url": "https://bugzilla.suse.com/1271893"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-44687"
},
{
"cve": "CVE-2026-44690",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-44690"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison arbitrary sibling zones under NSEC-signed parent domains. A malicious actor with one registered domain under an NSEC-signed TLD can serve malicious insecure DNS responses for unrelated sibling domains (sharing the same parent zone). Arbitrary delegations that do not exist under the parent domain and are covered by the parent\u0027s NSEC chain can be brought into insecure existence by fraudulent wildcard DS records (less labels than expected, unknown algorithm) from the malicious sibling domain. This allows the malicious actor to inject insecure wildcard records for those delegations.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-44690",
"url": "https://www.suse.com/security/cve/CVE-2026-44690"
},
{
"category": "external",
"summary": "SUSE Bug 1271877 for CVE-2026-44690",
"url": "https://bugzilla.suse.com/1271877"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "important"
}
],
"title": "CVE-2026-44690"
},
{
"cve": "CVE-2026-46582",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-46582"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, a replay of a wildcard rrset as another piece of data, could be briefly considered DNSSEC secure based only on the RRSIG validation and stored into cache, before later validation treats it as bogus based on NSEC validation. When the resolving thread puts secure on the rrset, and another thread that is on the serve expired path then picks up the updated rrset contents with the secure status for a reply, it can be used to change a specific record, next to a wildcard that could be covered by the wildcard, into the wildcard. A malicious actor can exploit the possible poisonous effect by having any DNSSEC-singed domain (irrelevant to the victim domain) and a CNAME wrapper record that points to a record next to a wildcard (that could be covered by the wildcard). Then quering Unbound for the wildcard sibling record would seed the secure message. A later (after expiry) query for the CNAME wrapper would need to resolve the target sibling record. If the wildcard replay is injected into the response, the wildcard rrset will update the expired sibling record with a secure status before completing proper wildcard validation with NSEC records and eventually treating the CNAME wrapper answer as bogus. The updated poisoned rrset is now secure and points to the wildcard. This vulnerability is explicit for the serve expired path and needs injection of the signed wildcard rrset without the NSEC accompanying rrset.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-46582",
"url": "https://www.suse.com/security/cve/CVE-2026-46582"
},
{
"category": "external",
"summary": "SUSE Bug 1271894 for CVE-2026-46582",
"url": "https://bugzilla.suse.com/1271894"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-46582"
},
{
"cve": "CVE-2026-50045",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50045"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a single client query for a deeply nested name under a DNSSEC-signed parent can cause Unbound to send more upstream packets per client query than the configured \u0027max-global-quota\u0027. This effectively bypasses a security configuration that limits upstream amplification traffic.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-50045",
"url": "https://www.suse.com/security/cve/CVE-2026-50045"
},
{
"category": "external",
"summary": "SUSE Bug 1271878 for CVE-2026-50045",
"url": "https://bugzilla.suse.com/1271878"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-50045"
},
{
"cve": "CVE-2026-50046",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50046"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS (DoT) forwarded queries is tied to a struct\u0027s (\u0027serviced_query\u0027) lifetime but also referenced by another struct (\u0027waiting_tcp\u0027). When the owning struct is jostled out of the mesh while the DoT TCP stream is still handshaking it frees the storage behind the referenced string and if the TLS stream then errors out, it dereferences the freed pointer. The dereference is read-only and the practical impact is a daemon crash resulting in denial of service. A malicious actor that knows a DoT forwarding/stub Unbound\u0027s configuration could exploit the vulnerability by quering records in the appropriate zone while keeping Unbound uder pressure so that the jostle logic kicks in. If answers for the vulnerable zone are slow, the likelihood of jostling such queries is higher, although the timing of the jostle needs to be precise. Requirements for a vulnerable Unbound is the existence of a stub/forward zone configured for DoT together with a configured \u0027#authname\u0027 suffix on the server identification. The connectivity to the server needs to exhibit a transient failure at the correct time in order to kick off the vulnerable error path.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-50046",
"url": "https://www.suse.com/security/cve/CVE-2026-50046"
},
{
"category": "external",
"summary": "SUSE Bug 1271882 for CVE-2026-50046",
"url": "https://bugzilla.suse.com/1271882"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-50046"
},
{
"cve": "CVE-2026-50243",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50243"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the \u0027respip\u0027 module in front of the validator together with a \u0027response-ip\u0027 redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer and can instead rewrite a BOGUS A/AAAA answer to point to an operator\u0027s configured IP. If the validator finds an expired or otherwise invalid RRSIG on an answer whose A record falls within a \u0027response-ip\u0027/RPZ configuration, the answer is still rewritten and given a hard coded security level of INSECURE. This results in the client receiving an INSECURE NOERROR reply rewritten by the operator\u0027s configured IP. A malicious actor can exploit the possible poisonous effect by spoofing a BOGUS A/AAAA answer that falls inside the operator\u0027s configured subnet rewrites. Such DNSSEC protected answers are then insecurely redirected to the operator\u0027s configured target.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-50243",
"url": "https://www.suse.com/security/cve/CVE-2026-50243"
},
{
"category": "external",
"summary": "SUSE Bug 1271880 for CVE-2026-50243",
"url": "https://bugzilla.suse.com/1271880"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-50243"
},
{
"cve": "CVE-2026-50248",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50248"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname\u0027s A/AAAA record (no valid RRSIG required) becomes the zone\u0027s XFR primary and can replaces the entire zone/the resolver\u0027s entire response policy.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-50248",
"url": "https://www.suse.com/security/cve/CVE-2026-50248"
},
{
"category": "external",
"summary": "SUSE Bug 1271881 for CVE-2026-50248",
"url": "https://bugzilla.suse.com/1271881"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-50248"
},
{
"cve": "CVE-2026-50251",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50251"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound up to and including version 1.25.1, when \u0027unwanted-reply-threshold\u0027 is enabled (set to any value greater than zero), glue records of 0.0.0.0/::0 can short-circuit Unbound, on systems that can direct such traffic, by issuing DNS queries and receiving seemingly unwanted replies since the remote IP does not match the original source IP of 0.0.0.0/::0. This behavior keeps on looping for the glue records and pushing the counter to the configured \u0027unwanted-reply-threshold\u0027 that triggers a defensive cache clear. A malicious actor who controls a delegation that returns in-bailiwick glue of 0.0.0.0/::0 can drive the counter to the limit of \u0027unwanted-reply-threshold\u0027 to the threshold and trigger a cache clean of the message and rrset caches; at will, indefinitely, without sending a single spoofed packet. The iterator uses the 0.0.0.0/::0 glue, and a system that can route this (e.g., Linux kernel routes the datagram over loopback), Unbound\u0027s own listener answers from 127.0.0.1. Because of the mismatch of 0.0.0.0 and 127.0.0.1, in this example, Unbound accounts the reply as an unwanted (probably spoofed) answer. The counter resets to zero on every cache flush, so the attack loops forever.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-50251",
"url": "https://www.suse.com/security/cve/CVE-2026-50251"
},
{
"category": "external",
"summary": "SUSE Bug 1271883 for CVE-2026-50251",
"url": "https://bugzilla.suse.com/1271883"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-50251"
},
{
"cve": "CVE-2026-50252",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50252"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.4.22 up to and including 1.25.1, UDP source port is randomized and intended to serve as a secret value that increases the entropy of DNS transactions. When resolver load balancing policies depend on the source port while their outcome is revealed this secrecy is undermined. The vulnerability arises when the load balancing policy is consistent with respect to the incoming source UDP port and IP address while heavily depending on the incoming source UDP port as a randomization source. When the SO_REUSEPORT configuration option is enabled (\u0027so-reuseport: yes\u0027) in Unbound (by default), it meets these conditions, making it vulnerable for DNS cache poisoning attacks. Upon startup, Unbound randomly partitions the available UDP source port space into disjoint subsets of (almost) equal size, assigning each subset to a specific worker thread. When an incoming DNS query is received, the kernel\u0027s SO_REUSEPORT load balancing mechanism deterministically assigns the query to a socket associated with a particular thread. All outgoing DNS queries generated during the resolution of that request use source ports selected exclusively from the port subset assigned to the corresponding thread. Since these port subsets are disjoint across threads, the source port observed in a resolver\u0027s outgoing query to an authoritative name server serves as a reliable indicator of the worker thread that processed the original client query. A malicious actor can acquire the mapping between incoming UDP source ports (for a given fixed source IP address) and Unbound worker threads and leverage it to conduct DNS cache poisoning attacks by effectively lowering the random port population per thread.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-50252",
"url": "https://www.suse.com/security/cve/CVE-2026-50252"
},
{
"category": "external",
"summary": "SUSE Bug 1271884 for CVE-2026-50252",
"url": "https://bugzilla.suse.com/1271884"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-50252"
},
{
"cve": "CVE-2026-54478",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-54478"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a \u0027proxy-protocol-port\u0027 interface with \u0027answer-cookie: yes\u0027, the RFC 9018 server-cookie SipHash is computed over the proxy\u0027s wire address instead of the PROXYv2-declared client. One server cookie obtained through a given proxy node therefore validates for every PROXYv2-declared source behind that node. On a UDP+proxy-protocol front, an off-path attacker can harvest one cookie with a single legitimate query, then replay it under any spoofed source and pass DNS Cookie checks that were deployed to defeat this in the first place.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-54478",
"url": "https://www.suse.com/security/cve/CVE-2026-54478"
},
{
"category": "external",
"summary": "SUSE Bug 1271895 for CVE-2026-54478",
"url": "https://bugzilla.suse.com/1271895"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-54478"
},
{
"cve": "CVE-2026-55708",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-55708"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, the \u0027view_local_data\u0027 and \u0027view_local_datas\u0027 commands of \u0027unbound-control\u0027 create a bare local zones tree for an already configured named view when the view is configured with no local data to begin with. However, the creation through the control interface omits adding the default-protected zones (e.g., RFC 1918 reverse, AS112 zones, .onion, .localhost). Once the local zone tree exists without the defaults, every query for a default-protected name from a client mapped to that view escapes to the public DNS via the iterator instead of being answered locally, bypassing local policy expectations.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-55708",
"url": "https://www.suse.com/security/cve/CVE-2026-55708"
},
{
"category": "external",
"summary": "SUSE Bug 1271896 for CVE-2026-55708",
"url": "https://bugzilla.suse.com/1271896"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-55708"
},
{
"cve": "CVE-2026-55717",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-55717"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.10.0 up to and including 1.25.1, when \u0027serve-expired: yes\u0027 is set together with a \u0027response-ip: \u003cnet\u003e redirect\u0027 /\u0027response-ip-data: \u003cnet\u003e CNAME \u003ctarget\u003e\u0027 rule (or the RPZ \u0027rpz-cname-override\u0027 equivalent), a remote client who controls any delegated domain can crash the daemon. The serve-expired-client-timeout callback runs a two-pass loop to chase the respip-generated CNAME alias; on the second pass it resets \u0027alias_rrset\u0027 but not \u0027partial_rep\u0027. Later, this inconsistency leads to a NULL pointer dereference and an eventual crash. A malicious actor can exploit the vulnerability by controlling any zone that replies with an A/AAAA record that falls inside the configured response-ip/rpz subnet. By delaying the answer when the previous record has expired, the vulnerable path of \u0027serve-expired-client-timeout\u0027 is taken leading to denial of service via the server crash.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-55717",
"url": "https://www.suse.com/security/cve/CVE-2026-55717"
},
{
"category": "external",
"summary": "SUSE Bug 1271886 for CVE-2026-55717",
"url": "https://bugzilla.suse.com/1271886"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-55717"
},
{
"cve": "CVE-2026-55990",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-55990"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the \u0027dnscrypt:\u0027 clause lists more \u0027dnscrypt-provider-cert:\u0027 files than there are matching \u0027dnscrypt-secret-key:\u0027 files, Unbound fills only the matched prefix and leaves the tail slots at the \u00270xdb\u0027 fill that libsodium\u0027s allocator writes into every allocation. Unbound would then iterate over the number of cert files, not the actual slots, so it walks into a slot with garbage data filled with \u00270xdb\u0027 bytes. Any unauthenticated client that sends one UDP datagram of \u2265 68 bytes whose first 8 bytes are \u00270xdb\u0027 to \u0027dnscrypt-port\u0027 will use that garbage entry which leads to a garbage dereference killing the server. This is a silent faulty configuration that goes unnoticed until triggered with the right client query. Unbound needs to be compiled with DNSCrypt support (\u0027--enable-dnscrypt\u0027).",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-55990",
"url": "https://www.suse.com/security/cve/CVE-2026-55990"
},
{
"category": "external",
"summary": "SUSE Bug 1271887 for CVE-2026-55990",
"url": "https://bugzilla.suse.com/1271887"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-55990"
},
{
"cve": "CVE-2026-55991",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-55991"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a remote unauthenticated client can trigger a libngtcp2 assertion (if compiled with assertions on) and terminate the entire Unbound process using a single DNS-over-QUIC (DoQ) connection and one normal DNS query. This is caused by an erroneous error value passed to libngtcp2. When \u0027ngtcp2_conn_writev_stream()\u0027 returns \u0027NGTCP2_ERR_STREAM_DATA_BLOCKED\u0027, Unbound continues to call \u0027ngtcp2_ccerr_set_application_error()\u0027 with a \u0027-1\u0027 error value. The \u0027int\u0027 literal \u0027-1\u0027 is implicitly converted to the function\u0027s \u0027uint64_t error_code\u0027 parameter as \u00270xFFFFFFFFFFFFFFFF\u0027. The follow-on \u0027ngtcp2_conn_write_connection_close()\u0027 serialises that value as a QUIC variable-length integer; because \u00272^64-1\u0027 exceeds the 62-bit varint ceiling, \u0027ngtcp2_put_uvarintlen()\u0027 fails \u0027assert(n \u003c 4611686018427387904ULL)\u0027 and the whole resolver process aborts. A remote, unauthenticated DoQ client can trigger this deterministically with a single QUIC connection by advertising \u0027initial_max_stream_data_bidi_local = 1\u0027 in its transport parameters and sending one DoQ query without ever reading the stream.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-55991",
"url": "https://www.suse.com/security/cve/CVE-2026-55991"
},
{
"category": "external",
"summary": "SUSE Bug 1271888 for CVE-2026-55991",
"url": "https://bugzilla.suse.com/1271888"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-55991"
},
{
"cve": "CVE-2026-56416",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-56416"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound up to and including version 1.25.1, when the validator builds the canonical RDATA form for an RRSIG-covered PX/RP/MINFO/SOA RRset, it computes the address of the second embedded domain name as \u0027datstart + dname_valid(datstart, ...)\u0027 and passes it straight to \u0027query_dname_tolower()\u0027 without checking that a second name is actually present in the RDATA. The wire-format parser accepts multi-dname RRs whose RDATA ends after the first name, so an attacker who runs a DNSSEC-signed authoritative server can deliver a record with an absent second domain name (e.g. SOA record) and cause \u0027query_dname_tolower()\u0027 to walk label-by-label through stale bytes in the per-worker \u0027env-\u003escratch_buffer\u0027, past the end of that heap allocation if \u0027msg-buffer-size\u0027 has been lowered from the default. This leads to heap buffer overflow and on a release build the outcome relies heavily on the contents of the buffer tail and the adjacent heap chunk.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-56416",
"url": "https://www.suse.com/security/cve/CVE-2026-56416"
},
{
"category": "external",
"summary": "SUSE Bug 1271889 for CVE-2026-56416",
"url": "https://bugzilla.suse.com/1271889"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.6,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-56416"
},
{
"cve": "CVE-2026-56444",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-56444"
}
],
"notes": [
{
"category": "general",
"text": "In NLnet Labs Unbound 1.20.0 up to and including 1.25.1, when Unbound is configured with \u0027serve-expired: yes\u0027 and \u0027serve-expired-client-timeout \u003e discard-timeout \u003e 0\u0027 (contrary to the suggested values), the discard-timeout branch during the serve expired logic drops an aged client reply without performing the correct accounting for the number of reply addresses for the query. Other identical branches outside of serve expired perform the correct decrement. Since the counter is never decremented in such scenario, it can reach the maximum limit and new clients for duplicate in-flight queries are silently dropped resulting in degradation of resolution service. A malicious actor can exploit the vulnerability by querying the resolver for a client-controlled slow-on-demand authoritative zone that can drive the counter past the threshold. Shipped defaults for \u0027serve-expired-client-timeout: 1800\u0027 and \u0027discard-timeout: 1900\u0027 make the branch unreachable.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-56444",
"url": "https://www.suse.com/security/cve/CVE-2026-56444"
},
{
"category": "external",
"summary": "SUSE Bug 1271890 for CVE-2026-56444",
"url": "https://bugzilla.suse.com/1271890"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:libunbound8-1.25.2-1.1.x86_64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.aarch64",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.s390x",
"SUSE Linux Micro 6.0:unbound-anchor-1.25.2-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-26T14:27:41Z",
"details": "moderate"
}
],
"title": "CVE-2026-56444"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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