High [CVE-2026-81634] Heap buffer overflow via malicious DNSSEC response
This high-severity Red Hat Linux advisory covers CVE-2026-81634; related products: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8.
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Summary
Heap buffer overflow via malicious DNSSEC response. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-122. Red Hat lists fixing advisory RHSA-2026:71419 with package unbound-0:1.24.2-3.el9_8.8, unbound-0:1.24.2-7.el10_2.6, unbound-main-1.26.1-1.hum1, unbound-0:1.16.2-5.14.el8_10.4.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8.
- 1.26.0
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- unbound-0:1.24.2-3.el9_8.8
- unbound-0:1.24.2-7.el10_2.6
- unbound-main-1.26.1-1.hum1
- unbound-0:1.16.2-5.14.el8_10.4
- RHSA-2026:71419
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation
Upgrade to a fixed release: unbound-0:1.24.2-3.el9_8.8, unbound-0:1.24.2-7.el10_2.6, unbound-main-1.26.1-1.hum1, unbound-0:1.16.2-5.14.el8_10.4, RHSA-2026:71419. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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