RHSA-2026:68291
Vulnerability from csaf_opensuse - Published: 2026-09-16 00:00 - Updated: 2026-09-21 08:44Summary
security update for unbound
Severity
Moderate
Notes
Title of the patch: security update for unbound
Description of the patch: This security update provides a functional equivalent of RHSA-2026:68291.
The original Red Hat(R) advisory is available from the Red Hat web site at
https://access.redhat.com/errata/RHSA-2026:68291.
Patchnames: RHSA-2026:68291
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
7 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Liberty Linux 10:python3-unbound-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 10:unbound-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 10:unbound-anchor-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 10:unbound-devel-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 10:unbound-dracut-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 10:unbound-libs-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 10:unbound-utils-0:1.24.2-7.el10_2.5.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
References
7 references
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"vulnerabilities": [
{
"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": {
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{
"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": [
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],
"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": [
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"SUSE Liberty Linux 10:unbound-utils-0:1.24.2-7.el10_2.5.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-09-16T00:00:00Z",
"details": "moderate"
}
],
"title": "CVE-2026-50252"
}
]
}
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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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