| Name | CVE-2026-43964 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1135718 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| postfix (PTS) | bullseye | 3.5.25-0+deb11u1 | vulnerable |
| bookworm | 3.7.11-0+deb12u1 | vulnerable |
| trixie | 3.10.11-0+deb13u1 | fixed |
| trixie (security) | 3.10.12-0+deb13u2 | fixed |
| forky, sid | 3.11.5-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| postfix | source | trixie | 3.10.10-0+deb13u1 | | | |
| postfix | source | (unstable) | 3.11.2-1 | | | 1135718 |
Notes
[bookworm] - postfix <no-dsa> (Minor issue)
[bullseye] - postfix <postponed> (Minor issue, 1-byte OOB read in non-SMTP code)
https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html
https://www.openwall.com/lists/oss-security/2026/05/04/25