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Advisory severityCritical9.8Red Hat Linux

Critical [CVE-2026-81642] Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY

This critical-severity Red Hat Linux advisory covers CVE-2026-81642; related products: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-81642 Source published Source updated

VulniPulse record published Record updated

CVE-2026-81642
Related products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY. Red Hat rates this critical (CVSS 9.8).

Weakness: CWE-122. Red Hat lists fixing advisory RHSA-2026:71419 with package unbound-0:1.6.6-5.el7_9.2, unbound-0:1.16.2-3.el9_2.6, unbound-0:1.16.2-8.el9_4.3, unbound-0:1.16.2-19.el9_6.2.

Affected products named by the advisory: Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8.

Affected versions
  • 1.26.0

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions
  • unbound-0:1.6.6-5.el7_9.2
  • unbound-0:1.16.2-3.el9_2.6
  • unbound-0:1.16.2-8.el9_4.3
  • unbound-0:1.16.2-19.el9_6.2
  • unbound-0:1.20.0-18.el10_0.13
  • unbound-0:1.24.2-3.el9_8.8
  • unbound-0:1.24.2-7.el10_2.6
  • unbound-0:1.7.3-17.el8_6.8
  • unbound-0:1.16.2-5.el8_8.6
  • unbound-main-1.26.1-1.hum1
  • unbound-0:1.7.3-15.el8_4.4
  • unbound-0:1.16.2-5.14.el8_10.4
  • RHSA-2026:71419

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

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