RHSA-2026:55841
Vulnerability from csaf_redhat - Published: 2026-08-17 21:46 - Updated: 2026-08-18 02:05Summary
Red Hat Security Advisory: unbound security update
Severity
Important
Notes
Topic: An update for unbound is now available for Red Hat Enterprise Linux 9.
Red Hat Product Security has rated this update as having a security impact of Important. 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: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes (CVE-2026-44690)
* unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option (CVE-2026-55973)
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. Insufficient validation of the RRSIG.Labels field, combined with premature cache writes during RFC 8198 aggressive NSEC processing, can lead to cache poisoning. This vulnerability allows a malicious actor, controlling a single delegated zone, to poison arbitrary sibling zones under NSEC-signed parent domains. The primary impact is the integrity of DNS resolution, potentially leading to users being directed to malicious websites or services.
8.6 (High)
Affected products
Fixed
63 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.src | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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Threats
Impact
Important
A flaw was found in Unbound. When the 'dns-error-reporting: yes' option is enabled, a remote attacker can send a specially crafted DNS response containing a malformed EDNS Report-Channel option from a delegated zone they control. This can lead to a stack variable overwrite, causing the Unbound daemon to terminate. This vulnerability results in a denial of service.
7.5 (High)
Affected products
Fixed
63 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.src | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.4.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.i686 | — |
Vendor Fix
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.4.x86_64 | — |
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Threats
Impact
Important
References
14 references
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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: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes (CVE-2026-44690)\n\n* unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option (CVE-2026-55973)\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.",
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"text": "A flaw was found in Unbound. Insufficient validation of the RRSIG.Labels field, combined with premature cache writes during RFC 8198 aggressive NSEC processing, can lead to cache poisoning. This vulnerability allows a malicious actor, controlling a single delegated zone, to poison arbitrary sibling zones under NSEC-signed parent domains. The primary impact is the integrity of DNS resolution, potentially leading to users being directed to malicious websites or services.",
"title": "Vulnerability description"
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"text": "unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "This Important flaw in Unbound allows a remote attacker to perform DNS cache poisoning. By controlling a delegated zone, a malicious actor can manipulate DNS resolution for arbitrary sibling zones under NSEC-signed parent domains, potentially redirecting users to malicious destinations. This poses a significant integrity risk to systems relying on Unbound for DNS resolution.",
"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-2026-44690"
},
{
"category": "external",
"summary": "RHBZ#2503063",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503063"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-44690",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-44690"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44690",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44690"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-17T21:46:43+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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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
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"title": "unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes"
},
{
"cve": "CVE-2026-55973",
"cwe": {
"id": "CWE-805",
"name": "Buffer Access with Incorrect Length Value"
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"discovery_date": "2026-07-20T21:57:00.775000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2503075"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Unbound. When the \u0027dns-error-reporting: yes\u0027 option is enabled, a remote attacker can send a specially crafted DNS response containing a malformed EDNS Report-Channel option from a delegated zone they control. This can lead to a stack variable overwrite, causing the Unbound daemon to terminate. This vulnerability results in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important denial of service flaw in Unbound occurs when the `dns-error-reporting` option is explicitly enabled, allowing a remote attacker to terminate the daemon with a crafted DNS response. While several Red Hat products are affected, many Red Hat Enterprise Linux and OpenShift Container Platform versions are not vulnerable as the affected code is not present.",
"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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"url": "https://access.redhat.com/security/cve/CVE-2026-55973"
},
{
"category": "external",
"summary": "RHBZ#2503075",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503075"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-55973",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55973"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-55973",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55973"
},
{
"category": "external",
"summary": "https://nlnetlabs.nl/projects/unbound/download/#unbound-1-25-2",
"url": "https://nlnetlabs.nl/projects/unbound/download/#unbound-1-25-2"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-17T21:46:43+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": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:55841"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"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:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option"
}
]
}
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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.
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.
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