Vulnerability · Published Sep 19, 2026 · Assigned by mitre
CVE-2026-94057
Medium 4.0
In plain English
A medium-severity security flaw in Exim from Exim. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.2%top 90.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | exim4 | no fix listed | DEBIAN-CVE-2026-94057 |
| Debian:13 | exim4 | 4.98.2-1+deb13u5 | DEBIAN-CVE-2026-94057 |
| Debian:14 | exim4 | 4.100.1-1 | DEBIAN-CVE-2026-94057 |
| Ubuntu:22.04:LTS | exim4 | 4.95-4ubuntu2.12 | UBUNTU-CVE-2026-94057 |
| Ubuntu:22.04:LTS | exim4 | 4.95-4ubuntu2.12 | USN-8834-1 |
| Ubuntu:24.04:LTS | exim4 | 4.97-4ubuntu4.8 | USN-8834-1 |
| Ubuntu:24.04:LTS | exim4 | 4.97-4ubuntu4.8 | UBUNTU-CVE-2026-94057 |
| Ubuntu:26.04:LTS | exim4 | 4.99.1-1ubuntu1.5 | USN-8834-1 |
| Ubuntu:26.04:LTS | exim4 | 4.99.1-1ubuntu1.5 | UBUNTU-CVE-2026-94057 |
Affected products (as reported)
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N