Use After Free in Exim

CVE-2026-94055

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

Vulnerability class: Use-After-Free

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (21.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-94055: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-94055?
CVE-2026-94055 is a low-severity vulnerability in Exim, classified under Use After Free. CVSS score: 3.7/10. Published 2026-09-19.
How severe is CVE-2026-94055?
Low severity. CVSS v3 base score is 3.7 out of 10.