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
mitreCNA
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: 11%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
postfixpostfix
2.3 ≤
𝑥
< 3.8.16
CNA
postfixpostfix
3.9 ≤
𝑥
< 3.9.10
CNA
postfixpostfix
3.10 ≤
𝑥
< 3.10.9
CNA
Debian logo
Debian Releases
Debian Product
Codename
postfix
bookworm
no-dsa
bullseye
vulnerable
forky
vulnerable
sid
3.11.2-4
fixed
trixie
no-dsa
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html
http://www.openwall.com/lists/oss-security/2026/05/04/30