CVE-2026-43964

EUVD-2026-27115
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 34.2%
Affected Products (NVD)
VendorProductVersion
postfixpostfix
𝑥
< 3.8.16
postfixpostfix
3.9.0 ≤
𝑥
< 3.9.10
postfixpostfix
3.10.0 ≤
𝑥
< 3.10.9
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
Red HatRed Hat Enterprise Linux 10
2:3.8.5-10.el10_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
2:3.5.8-8.el8_10 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
2:3.5.8-4.el8_6.1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
2:3.5.8-4.el8_6.1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
2:3.5.8-4.el8_8.1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
2:3.5.8-4.el8_8.1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
2:3.5.25-3.el9_8 ≤
𝑥
< *
ADP
Debian logo
Debian Releases
Debian Product
Codename
postfix
bookworm
no-dsa
bullseye
postponed
forky
3.11.5-1
fixed
sid
3.11.5-1
fixed
trixie
3.10.11-0+deb13u1
fixed
trixie (security)
3.10.12-0+deb13u2
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
postfix
bionic
Fixed 3.3.0-1ubuntu0.4+esm4
released
focal
Fixed 3.4.13-0ubuntu1.4+esm1
released
jammy
Fixed 3.6.4-1ubuntu1.4
released
noble
Fixed 3.8.6-1ubuntu0.1
released
questing
Fixed 3.10.2-1ubuntu2.1
released
resolute
Fixed 3.10.6-4ubuntu2.1
released
trusty
Fixed 2.11.0-1ubuntu1.2+esm4
released
xenial
Fixed 3.1.0-3ubuntu0.4+esm4
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
postfix
suse enterprise desktop 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise sap 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise server 12 SP3
3.2.10-3.33.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
suse enterprise server 15 SP7
3.8.4-150600.3.6.1
fixed
postfix-bdb
suse enterprise sap 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
suse enterprise server 15 SP7
3.8.4-150600.3.6.1
fixed
postfix-bdb-lmdb
suse enterprise sap 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
suse enterprise server 15 SP7
3.8.4-150600.3.6.1
fixed
postfix-devel
suse enterprise desktop 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise sap 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
suse enterprise server 15 SP7
3.8.4-150600.3.6.1
fixed
postfix-doc
suse enterprise desktop 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise sap 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise server 12 SP3
3.2.10-3.33.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
suse enterprise server 15 SP7
3.8.4-150600.3.6.1
fixed
postfix-ldap
suse enterprise desktop 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise sap 15 SP7
3.8.4-150600.3.6.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
suse enterprise server 15 SP7
3.8.4-150600.3.6.1
fixed
postfix-mysql
suse enterprise server 12 SP3
3.2.10-3.33.1
fixed
suse enterprise server 15 SP4
3.5.9-150300.5.20.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
postfix
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-cdb
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-ldap
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-lmdb
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-mysql
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-pcre
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-perl-scripts
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-pgsql
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
postfix-sqlite
RHEL 8
2:3.5.8-8.el8_10
fixed
RHEL 9
2:3.5.25-3.el9_8
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
postfix
Azure Linux 3.0
0:3.9.11-1.azl3
fixed
Common Weakness Enumeration
References
https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html
http://www.openwall.com/lists/oss-security/2026/05/04/30
https://access.redhat.com/errata/RHSA-2026:25930
https://access.redhat.com/errata/RHSA-2026:25932
https://access.redhat.com/errata/RHSA-2026:26205
https://access.redhat.com/errata/RHSA-2026:50963
https://access.redhat.com/errata/RHSA-2026:50964
https://access.redhat.com/errata/RHSA-2026:51034
https://access.redhat.com/security/cve/CVE-2026-43964
https://bugzilla.redhat.com/show_bug.cgi?id=2466488
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43964.json