Medium severity · published Sep 19, 2026
CVE-2026-94055
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EX
Exim · Exim
4.98 before 4.100.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-94055
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-94055
Vendor Advisory
https://lists.exim.org/lurker/message/20260918.121220.0f87338e.en.html
More from Exim
9.8
CVE-2019-16928
Exim Out-of-bounds Write Vulnerability
9.8
CVE-2019-10149
Exim Mail Transfer Agent (MTA) Improper Input Validation
9.8
CVE-2018-6789
Exim Buffer Overflow Vulnerability
9.8
CVE-2010-4344
Exim Heap-Based Buffer Overflow Vulnerability
7.8
CVE-2010-4345
Exim Privilege Escalation Vulnerability