Vulnerability · Published Sep 19, 2026 · Assigned by mitre
CVE-2026-94054
High 7.0
In plain English
A high-severity out-of-bounds write 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 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.0High
Exploit odds (30 days)0.3%top 81.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | exim4 | no fix listed | DEBIAN-CVE-2026-94054 |
| Debian:13 | exim4 | 4.98.2-1+deb13u5 | DEBIAN-CVE-2026-94054 |
| Debian:14 | exim4 | 4.100.1-1 | DEBIAN-CVE-2026-94054 |
| Ubuntu:22.04:LTS | exim4 | 4.95-4ubuntu2.12 | USN-8834-1 |
| Ubuntu:22.04:LTS | exim4 | 4.95-4ubuntu2.12 | UBUNTU-CVE-2026-94054 |
| Ubuntu:24.04:LTS | exim4 | 4.97-4ubuntu4.8 | UBUNTU-CVE-2026-94054 |
| Ubuntu:24.04:LTS | exim4 | 4.97-4ubuntu4.8 | USN-8834-1 |
| Ubuntu:26.04:LTS | exim4 | 4.99.1-1ubuntu1.5 | UBUNTU-CVE-2026-94054 |
| Ubuntu:26.04:LTS | exim4 | 4.99.1-1ubuntu1.5 | USN-8834-1 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L