High [CVE-2026-43964] buffer over-read via malformed enhanced status code
This high-severity Red Hat Linux advisory covers CVE-2026-43964 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.
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Summary
buffer over-read via malformed enhanced status code. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-193. Affected package(s): postfix.
Resolved in Red Hat advisory RHSA-2026:25932 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; and 5 more.
- postfix-2:3.5.8-8.el8_10
- postfix-2:3.8.5-10.el10_2
- postfix-2:3.5.25-3.el9_8
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:25932
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-2026:25932 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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