RHSA-2026:70754
Vulnerability from csaf_opensuse - Published: 2026-09-23 14:12 - Updated: 2026-09-24 21:49Summary
Red Hat Security Advisory: unbound security update
Severity
Critical
Notes
Topic: An update for unbound is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
* unbound: Unbound: Remote Code Execution Vulnerability in CNAME Synthesis (CVE-2026-82717)
* unbound: Unbound: Heap buffer overflow via malicious DNSSEC response (CVE-2026-81634)
* unbound: Unbound: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY (CVE-2026-81642)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Unbound. This vulnerability allows a remote attacker to cause a heap buffer overflow during the processing of DNSSEC responses. By sending a specially crafted DNSSEC response, a malicious server or an attacker tampering with network traffic can trigger this flaw. This could lead to a denial of service, making the Unbound service unavailable.
7.5 (High)
Affected products
Fixed
39 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.16.2-5.14.el8_10.4.i686 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-0:1.16.2-5.14.el8_10.4.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debuginfo-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debuginfo-0:1.16.2-5.14.el8_10.4.i686 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debuginfo-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debuginfo-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debuginfo-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debugsource-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debugsource-0:1.16.2-5.14.el8_10.4.i686 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debugsource-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debugsource-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-debugsource-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-devel-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-devel-0:1.16.2-5.14.el8_10.4.i686 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-devel-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-devel-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-devel-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-0:1.16.2-5.14.el8_10.4.i686 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.16.2-5.14.el8_10.4.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.16.2-5.14.el8_10.4.i686 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.16.2-5.14.el8_10.4.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.16.2-5.14.el8_10.4.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.16.2-5.14.el8_10.4.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in Unbound's DNSSEC validator. A remote attacker can exploit this vulnerability by controlling a malicious zone and sending a specially crafted DNSKEY record. This can lead to a heap buffer overflow, potentially resulting in a denial of service or remote code execution.
9.8 (Critical)
Affected products
Fixed
39 products, the same list as for
CVE-2026-81634
Threats
Impact
Critical
A flaw was found in Unbound. Improper handling of buffer positions and compression pointers in Unbound's CNAME synthesis allows a remote attacker to corrupt heap memory via upstream DNS responses. This vulnerability can result in a denial of service (DoS) or, under specific conditions, remote code execution (RCE).
8.1 (High)
Affected products
Fixed
39 products, the same list as for
CVE-2026-81634
Threats
Impact
Important
References
21 references
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{
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{
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"text": "A flaw was found in Unbound\u0027s DNSSEC validator. A remote attacker can exploit this vulnerability by controlling a malicious zone and sending a specially crafted DNSKEY record. This can lead to a heap buffer overflow, potentially resulting in a denial of service or remote code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "unbound: Unbound: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY"
},
{
"cve": "CVE-2026-82717",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
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"discovery_date": "2026-09-16T08:51:07.266602+00:00",
"ids": [
{
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"text": "2535051"
}
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"notes": [
{
"category": "description",
"text": "A flaw was found in Unbound. Improper handling of buffer positions and compression pointers in Unbound\u0027s CNAME synthesis allows a remote attacker to corrupt heap memory via upstream DNS responses. This vulnerability can result in a denial of service (DoS) or, under specific conditions, remote code execution (RCE).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Remote Code Execution Vulnerability in CNAME Synthesis",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important vulnerability in Unbound that could lead to remote code execution due to heap memory corruption during CNAME synthesis. As Unbound is a critical DNS resolver component in Red Hat environments, successful exploitation could severely impact service availability and integrity. The complexity of exploiting heap memory corruption may limit immediate widespread attacks.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-82717",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-82717"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-82717",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82717"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-82717.txt",
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{
"category": "vendor_fix",
"date": "2026-09-23T14:12:22+00:00",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:70754"
},
{
"category": "workaround",
"details": "To mitigate this restrict Unbound to trusted clients and limit which upstream name servers it can query. If Unbound is unused, disable or remove the service. Apply process/cgroup limits to contain crash impact.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "unbound: Unbound: Remote Code Execution Vulnerability in CNAME Synthesis"
}
]
}
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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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