RHSA-2026:72183
Vulnerability from csaf_redhat - Published: 2026-09-25 23:05 - Updated: 2026-11-06 01:06Summary
Red Hat Security Advisory: unbound security update
Severity
Critical
Notes
Topic: An update for unbound is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.
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: 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'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
14 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-0:1.7.3-15.el8_4.4.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-0:1.7.3-15.el8_4.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-libs-0:1.7.3-15.el8_4.4.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-libs-0:1.7.3-15.el8_4.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-0:1.7.3-15.el8_4.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-0:1.7.3-15.el8_4.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-0:1.7.3-15.el8_4.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-0:1.7.3-15.el8_4.4.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-0:1.7.3-15.el8_4.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-0:1.7.3-15.el8_4.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-0:1.7.3-15.el8_4.4.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-0:1.7.3-15.el8_4.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-0:1.7.3-15.el8_4.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-0:1.7.3-15.el8_4.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
40 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.4.0.Z.AUS:python3-unbound-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-debuginfo-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-debuginfo-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-debugsource-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-debugsource-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-devel-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-devel-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-0:1.7.3-15.el8_4.4.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-0:1.7.3-15.el8_4.4.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-0:1.7.3-15.el8_4.4.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-unbound-debuginfo-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debuginfo-0:1.7.3-15.el8_4.4.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debuginfo-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debuginfo-0:1.7.3-15.el8_4.4.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debuginfo-0:1.7.3-15.el8_4.4.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debuginfo-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debugsource-0:1.7.3-15.el8_4.4.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debugsource-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debugsource-0:1.7.3-15.el8_4.4.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debugsource-0:1.7.3-15.el8_4.4.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-debugsource-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-devel-0:1.7.3-15.el8_4.4.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-devel-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-devel-0:1.7.3-15.el8_4.4.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-devel-0:1.7.3-15.el8_4.4.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-devel-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.i686 | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:unbound-libs-debuginfo-0:1.7.3-15.el8_4.4.x86_64 | — |
Workaround
|
Threats
Impact
Critical
References
9 references
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2535059"
}
],
"notes": [
{
"category": "description",
"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": "other",
"text": "A CRITICAL severity flaw was found in Unbound\u0027s DNSSEC validator as shipped in Red Hat Enterprise Linux, Red Hat In-Vehicle OS, and the hummingbird-1 hardened image. When digesting DNSKEY records, a DNSKEY whose owner name contains a compression pointer into its own RDATA can overflow the digest buffer, causing a heap buffer overflow. A remote attacker who controls a malicious DNS zone can exploit a vulnerable Unbound resolver by getting it to process such a specially crafted DNSKEY record, resulting in denial of service and possible remote code execution through attacker-controlled data; exploitation requires no privileges or user interaction (Red Hat CVSS 3.1: 9.8, AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H, matching the NIST score). The unbound component in RHEL 7, 8, 9, and 10, Red Hat In-Vehicle OS 2, the hummingbird-1 hardened image, and the Fedora community distribution are affected, and fixes have shipped or are being pursued through the delegated business-unit errata process. OpenShift Container Platform update streams have been assessed as not affected. The rhel-6-els stream is out of support and is not receiving a fix.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-81642"
},
{
"category": "external",
"summary": "RHBZ#2535059",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535059"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-81642",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-81642"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-81642",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81642"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt"
}
],
"release_date": "2026-09-16T08:30:58.604000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-25T23:05:08+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Critical"
}
],
"title": "unbound: Unbound: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.