CVE catalog

CVE-2010-1194

libesmtp: CVE-2010-1194

Severity: Medium
Published: Mar 31, 2010, 6:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.35% · Oct 25, 2026

The match_component function in smtp-tls.c in libESMTP 1.0.3.r1, and possibly other versions including 1.0.4, treats two strings as equal if one is a substring of the other, which allows remote attackers to spoof trusted certificates via a crafted subjectAltName.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libesmtp	sid	`1.1.0-3.2`	fixed
Debian	libesmtp	forky	`1.1.0-3.2`	fixed
Debian	libesmtp	trixie	`1.1.0-3.2`	fixed
Debian	libesmtp	bookworm	`1.1.0-3.1~deb12u1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libesmtp	source	sid	`1.0.4-2`	not yet assigned	Not reported	[311191]
Debian	libesmtp	source	forky	`1.0.4-2`	not yet assigned	Not reported	[311191]
Debian	libesmtp	source	trixie	`1.0.4-2`	not yet assigned	Not reported	[311191]
Debian	libesmtp	source	bookworm	`1.0.4-2`	not yet assigned	Not reported	[311191]

[Debian bug #311191]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libesmtp6]Fixed
Source package: [libesmtp]
Details (2)
- 1.1.0-3.1~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · bookworm; dsa · libesmtp · debian · 12
- 1.1.0-3.1~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · bookworm; dsa · libesmtp · debian · 12
[libesmtp-dev]Fixed
Source package: [libesmtp]
Details (2)
- 1.1.0-3.1~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · bookworm; dsa · libesmtp · debian · 12
- 1.1.0-3.1~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · bookworm; dsa · libesmtp · debian · 12

[Debian 13 (Trixie)]

[libesmtp6]Fixed
Source package: [libesmtp]
Details (2)
- 1.1.0-3.2 · amd64 · trixie
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · 13
- 1.1.0-3.2 · arm64 · trixie
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · 13
[libesmtp-dev]Fixed
Source package: [libesmtp]
Details (2)
- 1.1.0-3.2 · amd64 · trixie
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · 13
- 1.1.0-3.2 · arm64 · trixie
  Fixed · Fixed: 1.0.4-2
  dsa · libesmtp · debian · 13

Observed: Oct 23, 2026, 5:04:54 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]