CVE-2026-43964
postfixVulnerabilityCVSS 3.7Patched
No public exploitation has been reported so far. A fixed version is available (see the table below).
Recommended action: Update to the fixed version listed for your distribution using the native package manager.
Severity metrics
CVSS 3.1 : 3.7 LOW
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
Confidentiality impactNone
Integrity impactNone
Availability impactLow
Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected & fixed versions by distribution
Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.
| Distribution | Package | Affected | Fixed version | Status |
|---|---|---|---|---|
| Debian:11 | postfix | - | - | affected (no fix yet) |
| Debian:12 | postfix | - | - | affected (no fix yet) |
| Debian:13 | postfix | - | 3.10.10-0+deb13u1 | fixed |
| Debian:14 | postfix | - | 3.11.2-1 | fixed |
| Ubuntu:Pro:14.04:LTS | postfix | - | 2.11.0-1ubuntu1.2+esm4 | fixed |
| Ubuntu:Pro:16.04:LTS | postfix | - | 3.1.0-3ubuntu0.4+esm4 | fixed |
| Ubuntu:Pro:18.04:LTS | postfix | - | 3.3.0-1ubuntu0.4+esm4 | fixed |
| Ubuntu:Pro:20.04:LTS | postfix | - | 3.4.13-0ubuntu1.4+esm1 | fixed |
| Ubuntu:22.04:LTS | postfix | - | 3.6.4-1ubuntu1.4 | fixed |
| Ubuntu:24.04:LTS | postfix | - | 3.8.6-1ubuntu0.1 | fixed |
| Ubuntu:25.10 | postfix | - | 3.10.2-1ubuntu2.1 | fixed |
| Ubuntu:26.04:LTS | postfix | - | 3.10.6-4ubuntu2.1 | fixed |
| SUSE:Linux Enterprise Server 16.0 | postfix | - | 3.10.2-160000.3.1 | fixed |
| SUSE:Linux Enterprise Server for SAP applications 16.0 | postfix | - | 3.10.2-160000.3.1 | fixed |
| SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | postfix | - | 3.2.10-3.33.1 | fixed |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | postfix | - | 3.8.4-150600.3.6.1 | fixed |
| SUSE:Linux Enterprise Module for Server Applications 15 SP7 | postfix | - | 3.8.4-150600.3.6.1 | fixed |
| openSUSE:Tumbleweed | postfix | - | 3.11.2-1.1 | fixed |
| openSUSE:Leap 16.0 | postfix | - | 3.10.2-160000.3.1 | fixed |
| Red Hat:enterprise_linux:10.2 | postfix | - | 2:3.8.5-10.el10_2 | fixed |
| Red Hat:enterprise_linux:8::baseos | postfix | - | 2:3.5.8-8.el8_10 | fixed |
| Red Hat:enterprise_linux:9::appstream | postfix | - | 2:3.5.25-3.el9_8 | fixed |