Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.
https://www.mail-archive.com/[email protected]/msg00110.html
http://www.openwall.com/lists/oss-security/2026/05/04/30
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43964.json
https://bugzilla.redhat.com/show_bug.cgi?id=2466488
https://access.redhat.com/security/cve/CVE-2026-43964
https://access.redhat.com/errata/RHSA-2026:26205
https://access.redhat.com/errata/RHSA-2026:25932
https://access.redhat.com/errata/RHSA-2026:25930
Source: Mitre, NVD
Published: 2026-05-04
Updated: 2026-06-30
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
Severity: High
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.00039