High7.5Red Hat & Ubuntu Linux

Heap overflow and crash with multiple nsid, cookie, padding EDNS options

CVE-2026-42944 Published May 20, 2026

CVE-2026-42944

Affected products & platforms

Red Hat & Ubuntu LinuxUnclassified

Summary

Heap overflow and crash with multiple nsid, cookie, padding EDNS options. Red Hat rates this important (CVSS 7.5). Affected package(s): unbound-main, unbound. Resolved in Red Hat advisory RHSA-2026:23231 — update the affected packages (`sudo dnf update`).

Affected versions

unbound-main-1.25.1-0.1.hum1
unbound-0:1.16.2-5.11.el8_10
unbound-0:1.24.2-7.el10_2.1
unbound-0:1.24.2-3.el9_8.1

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

RHSA-2026:23231

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:23231 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

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