High [CVE-2026-42944] Heap overflow and crash with multiple nsid, cookie, padding EDNS options
This high-severity Red Hat Linux advisory covers CVE-2026-42944 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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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 products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; and 3 more.
- 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 months ago·verify at source
- RHSA-2026:23231
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- 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 months ago·verify at source
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