RHSA-2026:97121
Vulnerability from csaf_redhat - Published: 2026-11-10 13:39 - Updated: 2026-11-10 13:45Summary
Red Hat Security Advisory: unbound security, bug fix, and enhancement update
Severity
Moderate
Notes
Topic: An update for unbound is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Moderate. 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 DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance (CVE-2026-42960)
* unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS (CVE-2026-42923)
* unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload (CVE-2026-44608)
Bug Fix(es) and Enhancement(s):
* Update to latest 1.26 (JIRA:RHEL-246536)
* [RHEL-10][AppStream] Packages present in comps but missing from repo: unbound (JIRA:RHEL-171309)
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.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from 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 where the code path for consulting the negative cache for DS records does not honor the limit on NSEC3 hash calculations introduced in version 1.19.1. An adversary who controls a DNSSEC-signed zone can sign NSEC3 records with high iteration counts for child delegations, causing Unbound to perform excessive hash computations while holding a global lock on the negative cache. This temporarily blocks other resolver threads from accessing the negative cache, leading to degraded DNS resolution performance for the duration of the attack.
5.3 (Medium)
Affected products
Fixed
101 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.3.GA:python3-unbound-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: AppStream-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-0:1.26.1-2.el10_3.src | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-dracut-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-dracut-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-dracut-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-dracut-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: BaseOS-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: CRB-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: CRB-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: CRB-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: CRB-10.3.GA:python3-unbound-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: CRB-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: CRB-10.3.GA:unbound-anchor-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.ppc64le | — |
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| Unresolved product id: CRB-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: CRB-10.3.GA:unbound-debuginfo-0:1.26.1-2.el10_3.x86_64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-debugsource-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-devel-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-libs-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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| Unresolved product id: CRB-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.aarch64 | — |
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| Unresolved product id: CRB-10.3.GA:unbound-utils-debuginfo-0:1.26.1-2.el10_3.s390x | — |
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Threats
Impact
Moderate
A flaw was found in Unbound's handling of DNS reply messages, complementing the earlier CVE-2025-11411 fix. Unbound accepts and caches address records from the additional section of DNS replies when they accompany authority section RRSets other than NS (such as MX records). A malicious actor who can inject crafted DNS responses—via packet spoofing or fragmentation attacks—can exploit this to poison Unbound's cache with attacker-controlled address records, potentially redirecting DNS resolution for affected domains.
5.9 (Medium)
Affected products
Fixed
101 products, the same list as for
CVE-2026-42923
Threats
Impact
Moderate
A flaw was found in Unbound. When operating in a multi-threaded configuration with specific Response Policy Zones (RPZ) using 'rpz-nsip' or 'rpz-nsdname' triggers, a locking inconsistency during an RPZ zone transfer (XFR) reload can occur. This timing issue may allow an adversary to trigger a heap use-after-free vulnerability, leading to a system crash and a Denial of Service (DoS).
5.9 (Medium)
Affected products
Fixed
101 products, the same list as for
CVE-2026-42923
Threats
Impact
Moderate
References
21 references
{
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"text": "Moderate"
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"csaf_version": "2.0",
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"text": "An update for unbound is now available for Red Hat Enterprise Linux 10.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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.",
"title": "Topic"
},
{
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"text": "The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. \n\nSecurity Fix(es):\n\n* unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance (CVE-2026-42960)\n\n* unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS (CVE-2026-42923)\n\n* unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload (CVE-2026-44608)\n\nBug Fix(es) and Enhancement(s):\n\n* Update to latest 1.26 (JIRA:RHEL-246536)\n\n* [RHEL-10][AppStream] Packages present in comps but missing from repo: unbound (JIRA:RHEL-171309)\n\nFor 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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from the References section.",
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"text": "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.",
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"category": "description",
"text": "A flaw was found in Unbound\u0027s DNSSEC validator where the code path for consulting the negative cache for DS records does not honor the limit on NSEC3 hash calculations introduced in version 1.19.1. An adversary who controls a DNSSEC-signed zone can sign NSEC3 records with high iteration counts for child delegations, causing Unbound to perform excessive hash computations while holding a global lock on the negative cache. This temporarily blocks other resolver threads from accessing the negative cache, leading to degraded DNS resolution performance for the duration of the attack.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate. The flaw can be remotely triggered without authentication, but the impact is limited to service degradation rather than a full denial-of-service.The Unbound process does not crash,a global negative cache lock is held during excessive NSEC3 hash computations, temporarily blocking other resolver threads. The root cause is a negative cache code path that bypasses the existing NSEC3 hash computation limits.",
"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-2026-42923"
},
{
"category": "external",
"summary": "RHBZ#2479825",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479825"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42923",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42923"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42923",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42923"
}
],
"release_date": "2026-05-20T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-11-10T13:39:44+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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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:97121"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS"
},
{
"acknowledgments": [
{
"names": [
"TaoFei Guo"
],
"organization": "Peking University"
},
{
"names": [
"Yang Luo",
"JianJun Chen"
],
"organization": "Tsinghua University"
}
],
"cve": "CVE-2026-42960",
"cwe": {
"id": "CWE-349",
"name": "Acceptance of Extraneous Untrusted Data With Trusted Data"
},
"discovery_date": "2026-05-19T12:09:50.308000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2479821"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Unbound\u0027s handling of DNS reply messages, complementing the earlier CVE-2025-11411 fix. Unbound accepts and caches address records from the additional section of DNS replies when they accompany authority section RRSets other than NS (such as MX records). A malicious actor who can inject crafted DNS responses\u2014via packet spoofing or fragmentation attacks\u2014can exploit this to poison Unbound\u0027s cache with attacker-controlled address records, potentially redirecting DNS resolution for affected domains.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate. Exploitation requires the attacker to successfully inject or spoof DNS response packets, which increases attack complexity. However, successful exploitation can result in DNS cache poisoning, allowing the attacker to redirect DNS resolution for affected domains.",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42960"
},
{
"category": "external",
"summary": "RHBZ#2479821",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479821"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42960",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42960"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42960",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42960"
}
],
"release_date": "2026-05-20T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-11-10T13:39:44+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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},
"url": "https://access.redhat.com/errata/RHSA-2026:97121"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance"
},
{
"cve": "CVE-2026-44608",
"cwe": {
"id": "CWE-367",
"name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
},
"discovery_date": "2026-05-20T10:00:58.538612+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2480126"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Unbound. When operating in a multi-threaded configuration with specific Response Policy Zones (RPZ) using \u0027rpz-nsip\u0027 or \u0027rpz-nsdname\u0027 triggers, a locking inconsistency during an RPZ zone transfer (XFR) reload can occur. This timing issue may allow an adversary to trigger a heap use-after-free vulnerability, leading to a system crash and a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-44608"
},
{
"category": "external",
"summary": "RHBZ#2480126",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480126"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-44608",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-44608"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44608",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44608"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt"
}
],
"release_date": "2026-05-20T09:21:57.360000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-11-10T13:39:44+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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},
"url": "https://access.redhat.com/errata/RHSA-2026:97121"
},
{
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload"
}
]
}
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.