CVE catalog

CVE-2026-94055

Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L
Published: Sep 19, 2026, 10:48:57 PM UTC
Updated: Sep 19, 2026, 11:17:10 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.29% · Oct 25, 2026

Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.

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	exim4	sid	`4.100.1-4`	fixed
Debian	exim4	forky	`4.100.1-4`	fixed
Debian	exim4	trixie	`4.98.2-1+deb13u4`	not affected
Debian	exim4	trixie-security	`4.98.2-1+deb13u5`	not affected
Debian	exim4	bookworm	`4.96-15+deb12u10`	not affected
Debian	exim4	bookworm-security	`4.96-15+deb12u10`	not affected
Cpe	exim	Not reported	`4.100.1`	fixed
Ubuntu	exim4	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	exim4-base	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	exim4-config	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	exim4-daemon-heavy	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	exim4-daemon-light	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	exim4-dev	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	eximon4	noble	`4.97-4ubuntu4.8`	fixed
Ubuntu	exim4	26.04	`4.98.2-1ubuntu2`	vulnerable
Ubuntu	exim4	26.04	`4.99-4ubuntu1`	vulnerable
Ubuntu	exim4	26.04	`4.99.1-1ubuntu1`	vulnerable
Ubuntu	exim4	26.04	`4.99.1-1ubuntu1.1`	vulnerable
Ubuntu	exim4	26.04	`4.99.1-1ubuntu1.2`	vulnerable
Ubuntu	exim4	26.04	`4.99.1-1ubuntu1.3`	vulnerable
Ubuntu	exim4	26.04	`4.99.1-1ubuntu1.4`	vulnerable
Ubuntu	exim4	26.04	`4.99.1-1ubuntu1.5`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	exim4	source	sid	`4.100.1-1`	not yet assigned	Not reported	[1148506]
Debian	exim4	source	forky	`4.100.1-1`	not yet assigned	Not reported	[1148506]
Debian	exim4	source	trixie	`Not affected`	unimportant	Not reported	[1148506]
Debian	exim4	source	bookworm	`Not affected`	unimportant	Not reported	[1148506]
Cpe	exim	cpe	Not reported	`4.100.1`	Not reported	NVD-CVE-2026-94055	Not reported
Ubuntu	exim4	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	exim4-base	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	exim4-config	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	exim4-daemon-heavy	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	exim4-daemon-light	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	exim4-dev	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	eximon4	deb	noble	`4.97-4ubuntu4.8`	Not reported	Not reported	Not reported
Ubuntu	exim4	deb	26.04	`4.99.1-1ubuntu1.5`	Not reported	UBUNTU-CVE-2026-94055	Not reported

[Debian bug #1148506]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[exim4]Not affected
Details (6)
- 4.96-15+deb12u10 · all · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · all · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · all · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · all · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · all · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · all · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
[exim4-base]Not affected
Source package: [exim4]
Details (6)
- 4.96-15+deb12u10 · amd64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · amd64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
[exim4-config]Not affected
Source package: [exim4]
Details (6)
- 4.96-15+deb12u10 · all · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · all · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · all · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · all · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · all · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · all · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
[exim4-daemon-heavy]Not affected
Source package: [exim4]
Details (6)
- 4.96-15+deb12u10 · amd64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · amd64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
[exim4-daemon-light]Not affected
Source package: [exim4]
Details (6)
- 4.96-15+deb12u10 · amd64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · amd64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
[exim4-dev]Not affected
Source package: [exim4]
Details (6)
- 4.96-15+deb12u10 · amd64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · amd64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
[eximon4]Not affected
Source package: [exim4]
Details (6)
- 4.96-15+deb12u10 · amd64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.98.2-1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · amd64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm
- 4.96-15+deb12u10 · arm64 · bookworm-security
  Not affected
  nvd · exim4 · debian · bookworm

Observed: Oct 27, 2026, 5:44:28 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]