---
id: CVE-2026-94055
title: >-
  Exim before 4.100.1, when certain non-default TLS settings are used with
  GnuTLS, has a use-after-free.
summary: >-
  Exim before 4.100.1, when certain non-default TLS settings are used with
  GnuTLS, has a use-after-free.
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-416
vendor: exim
product: exim
affected:
  - exim < 4.100.1
patched:
  - exim 4.100.1
published: '2026-09-19'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:45:59.800'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94055'
references:
  - url: 'https://lists.exim.org/lurker/message/20260918.121220.0f87338e.en.html'
    label: cve@mitre.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94055.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94055'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2538399'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94055'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94055'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00365
epssPercentile: 0.27575
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-21T15:18:50.531821Z'
ingestedAt: '2026-09-19T23:10:34.243Z'
---

## Overview

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

## Affected

- `exim < 4.100.1`

## Remediation

Upgrade past the affected range:

- `exim 4.100.1`

## Vendor advisories

- **Red Hat VEX** · Low · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94055.json)