CVE-2026-43964
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.
CVE-2026-43964 is fixed in 11 products on 1 platform, first by postfix 3.3.0-1ubuntu0.4+esm4, released May 4, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Low
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0051
43rd percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| postfix · Debian 13.5 (trixie) | 3.10.10-0+deb13u1 | DEBIAN-CVE-2026-43964 | May 15, 2026 |
| postfix · Debian 14 | 3.11.2-1 | DEBIAN-CVE-2026-43964 | May 15, 2026 |
| postfix · RHEL 10 | 3.8.5-8.el10_0.1 | RHSA-2026:51436 | May 4, 2026 |
| postfix · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix · opensuse-leap 16.0 | 3.10.2-160000.3.1 | OPENSUSE-SU-2026:21020-1 | Jun 22, 2026 |
| postfix · rocky 10 | 2:3.8.5-10.el10_2 | RLSA-2026:25930 | Jun 19, 2026 |
| postfix · rocky 8 | 2:3.5.8-8.el8_10 | RLSA-2026:25932 | Jun 17, 2026 |
| postfix · rocky 9 | 2:3.5.25-3.el9_8 | RLSA-2026:26205 | Jun 17, 2026 |
| postfix · sles 15.7 | 3.8.4-150600.3.6.1 | SUSE-SU-2026:2781-1 | Jul 6, 2026 |
| postfix · sles 16.0 | 3.10.2-160000.3.1 | SUSE-SU-2026:22335-1 | Jun 22, 2026 |
| postfix-bdb · opensuse-leap 16.0 | 3.10.2-160000.3.1 | OPENSUSE-SU-2026:21020-1 | Jun 22, 2026 |
| postfix-bdb · sles 15.7 | 3.8.4-150600.3.6.1 | SUSE-SU-2026:2781-1 | Jul 6, 2026 |
| postfix-cdb · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-cdb · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-cdb · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-cdb 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-cdb · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-cdb 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-cdb · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-cdb 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-cdb · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-cdb 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-cdb · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-cdb 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-cdb · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-cdb 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-cdb · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-cdb · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-cdb · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-cdb · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-cdb · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-cdb · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-ldap · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-ldap · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-ldap · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-ldap 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-ldap · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-ldap 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-ldap · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-ldap 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-ldap · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-ldap 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-ldap · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-ldap 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-ldap · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-ldap 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-ldap · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-ldap · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-ldap · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-ldap · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-ldap · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-ldap · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-lmdb · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-lmdb · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-lmdb 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-lmdb · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-lmdb 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-lmdb · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-lmdb 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-lmdb · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-lmdb 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-lmdb · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-lmdb 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-lmdb · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-lmdb 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-lmdb · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-lmdb · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-lmdb · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-lmdb · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-mongodb · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-mongodb 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-mongodb · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-mongodb 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-mysql · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-mysql · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-mysql · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-mysql 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-mysql · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-mysql 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-mysql · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-mysql 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-mysql · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-mysql 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-mysql · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-mysql 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-mysql · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-mysql 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-mysql · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-mysql · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-mysql · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-mysql · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-mysql · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-mysql · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-pcre · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-pcre · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-pcre · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-pcre 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-pcre · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-pcre 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-pcre · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-pcre 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-pcre · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-pcre 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-pcre · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-pcre 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-pcre · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-pcre 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-pcre · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-pcre · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-pcre · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-pcre · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-pcre · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-pcre · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-perl-scripts · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-perl-scripts · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-perl-scripts · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-perl-scripts · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-perl-scripts · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-perl-scripts · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-perl-scripts · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-perl-scripts · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-pgsql · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-pgsql · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-pgsql · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-pgsql 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-pgsql · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-pgsql 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-pgsql · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-pgsql 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-pgsql · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-pgsql 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-pgsql · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-pgsql 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-pgsql · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-pgsql 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-pgsql · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-pgsql · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-pgsql · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-pgsql · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-pgsql · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-pgsql · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
| postfix-sqlite · RHEL 8 | 2:3.5.8-8.el8_10 | RHSA-2026:25932 | Jun 24, 2026 |
| postfix-sqlite · RHEL 9 | 2:3.5.25-3.el9_8 | RHSA-2026:26205 | Jun 24, 2026 |
| postfix-sqlite · Ubuntu 18.04.6 LTS (bionic) | 3.3.0-1ubuntu0.4+esm4 | postfix-sqlite 3.3.0-1ubuntu0.4+esm4 | May 4, 2026 |
| postfix-sqlite · Ubuntu 20.04 LTS (focal) | 3.4.13-0ubuntu1.4+esm1 | postfix-sqlite 3.4.13-0ubuntu1.4+esm1 | May 4, 2026 |
| postfix-sqlite · Ubuntu 22.04.1 LTS (jammy) | 3.6.4-1ubuntu1.4 | postfix-sqlite 3.6.4-1ubuntu1.4 | May 15, 2026 |
| postfix-sqlite · Ubuntu 24.04.5 LTS (noble) | 3.8.6-1ubuntu0.1 | postfix-sqlite 3.8.6-1ubuntu0.1 | May 15, 2026 |
| postfix-sqlite · Ubuntu 25.10 (questing) | 3.10.2-1ubuntu2.1 | postfix-sqlite 3.10.2-1ubuntu2.1 | May 15, 2026 |
| postfix-sqlite · Ubuntu 26.04.1 LTS (resolute) | 3.10.6-4ubuntu2.1 | postfix-sqlite 3.10.6-4ubuntu2.1 | May 4, 2026 |
| postfix-sqlite · almalinux 10 | 2:3.8.5-10.el10_2 | ALSA-2026:25930 | Jun 15, 2026 |
| postfix-sqlite · almalinux 8 | 2:3.5.8-8.el8_10 | ALSA-2026:25932 | Jun 15, 2026 |
| postfix-sqlite · almalinux 9 | 2:3.5.25-3.el9_8 | ALSA-2026:26205 | Jun 16, 2026 |
| postfix-sqlite · ol 10 | 2:3.8.5-10.el10_2 | ELSA-2026-25930 | Jul 16, 2026 |
| postfix-sqlite · ol 8 | 2:3.5.8-8.el8_10 | ELSA-2026-25932 | Jun 16, 2026 |
| postfix-sqlite · ol 9 | 2:3.5.25-3.el9_8 | ELSA-2026-26205 | Jun 23, 2026 |
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