CVE-2026-94055
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after...
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
- Record
CVE-2026-94055- CVSS 3.1
- 3.7 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
EUVDEUVD-2026-83613
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
- Record
EUVD-2026-83613- CVSS 3.1
- 3.7 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jpgj-v2p6-hc2c
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after...
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
- Record
GHSA-jpgj-v2p6-hc2c- CVSS 3.1
- 3.7 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
NVD
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
- Record
CVE-2026-94055- CVSS 3.1
- 3.7 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-94055
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
- Record
DEBIAN-CVE-2026-94055- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-94055
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
- Record
UBUNTU-CVE-2026-94055- CVSS 3.1
- 3.7 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVUSN-8834-1 No score
exim4 vulnerabilities
It was discovered that Exim had an out-of-bounds write when Proxy-Protocol was used with an attacker-controlled proxy. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-94054)
It was discovered that Exim had a use-after-free when certain non-default TLS settings were used with GnuTLS. A remote attacker could possibly use this issue to cause Exim to crash, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-94055)
It was discovered that Exim allowed attackers to read uninitialized data from stack memory when Proxy-Protocol was used with an attacker-controlled proxy. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-94056)
It was discovered that Exim allowed SMTP smuggling via crafted data sent after a rejection during DATA processing. A remote attacker could possibly use this issue to inject arbitrary email messages. (CVE-2026-94057)
- Record
USN-8834-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
exim4Debian:14 |
before 4.100.1-1, plus listed versions 4.100-14.100-1~bpo13+14.100-34.100-44.100~RC1-1 Show 38 moreShow less4.100~RC2-14.100~RC3-14.100~RC3-24.98.2-14.98.2-1+hurd.14.98.2-24.99-14.99-24.99-34.99-44.99-4~bpo13+14.99-54.99-64.99-6~bpo13+14.99-74.99-7~bpo13+14.99.1-14.99.1-1~bpo13+14.99.1-24.99.1-34.99.1-44.99.1-54.99.1-64.99.2-14.99.2-1~bpo13+14.99.2-24.99.2-2~bpo13+14.99.3-14.99.3-24.99.3-2~bpo13+14.99.4-14.99.4-1~bpo13+14.99.4-24.99.4-2~bpo13+14.99~RC1-14.99~RC2-14.99~RC3-14.99~RC3-2 |
4.100.1-1 |
exim4Ubuntu:26.04:LTS |
before 4.99.1-1ubuntu1.5, plus listed versions 4.98.2-1ubuntu24.99-4ubuntu14.99.1-1ubuntu14.99.1-1ubuntu1.14.99.1-1ubuntu1.24.99.1-1ubuntu1.34.99.1-1ubuntu1.4 |
4.99.1-1ubuntu1.5 |
exim4Ubuntu:22.04:LTS |
before 4.95-4ubuntu2.12, plus listed versions 4.94.2-7ubuntu24.95-2ubuntu24.95-4ubuntu14.95-4ubuntu24.95-4ubuntu2.1 Show 10 moreShow less4.95-4ubuntu2.24.95-4ubuntu2.34.95-4ubuntu2.44.95-4ubuntu2.54.95-4ubuntu2.64.95-4ubuntu2.74.95-4ubuntu2.84.95-4ubuntu2.94.95-4ubuntu2.104.95-4ubuntu2.11 |
4.95-4ubuntu2.12 |
exim4Ubuntu:24.04:LTS |
before 4.97-4ubuntu4.8, plus listed versions 4.96-17ubuntu24.96-17ubuntu2.14.97-3ubuntu14.97-4ubuntu14.97-4ubuntu3 Show 8 moreShow less4.97-4ubuntu44.97-4ubuntu4.14.97-4ubuntu4.24.97-4ubuntu4.34.97-4ubuntu4.44.97-4ubuntu4.54.97-4ubuntu4.64.97-4ubuntu4.7 |
4.97-4ubuntu4.8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-94055 is a low vulnerability (CVSS 3.7) in Exim, published September 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. Fixed in exim4 4.100.1-1.