Vulnerability · Published Jul 24, 2026 · Assigned by mitre
CVE-2026-66141
High 7.4
In plain English
A high-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 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.1%top 96.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | exim | 4.98.5-r0 | ALPINE-CVE-2026-66141 |
| Debian:12 | exim4 | no fix listed | DEBIAN-CVE-2026-66141 |
| Debian:13 | exim4 | 4.98.2-1+deb13u4 | DEBIAN-CVE-2026-66141 |
| Debian:14 | exim4 | 4.99.4-2 | DEBIAN-CVE-2026-66141 |
| Ubuntu:22.04:LTS | exim4 | 4.95-4ubuntu2.11 | UBUNTU-CVE-2026-66141 |
| Ubuntu:24.04:LTS | exim4 | 4.97-4ubuntu4.7 | UBUNTU-CVE-2026-66141 |
| Ubuntu:26.04:LTS | exim4 | 4.99.1-1ubuntu1.4 | UBUNTU-CVE-2026-66141 |
Affected products (as reported)
Weakness: CWE-829 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H