CVE-2026-94055 Use after free in Exim
A use-after-free vulnerability in Exim allows attackers to execute code or cause denial of service when specific non-default TLS settings are enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94055?
CVE-2026-94055 is a low-severity use after free vulnerability in Exim Exim, published on 19 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
Weakness: CWE-416
Which versions are affected by CVE-2026-94055?
It affects 1 product.
Products include Exim Exim.
How do I fix CVE-2026-94055?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-94055 being exploited?
There is no known exploitation of CVE-2026-94055 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as DEBIAN-CVE-2026-94055, GHSA-jpgj-v2p6-hc2c, UBUNTU-CVE-2026-94055.