Vulnerability · Published Jul 24, 2026 · Assigned by mitre
CVE-2026-66140
High 8.4
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 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.4High
Exploit odds (30 days)0.4%top 67.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | exim | 4.98.5-r0 | ALPINE-CVE-2026-66140 |
| Debian:12 | exim4 | no fix listed | DEBIAN-CVE-2026-66140 |
| Debian:13 | exim4 | 4.98.2-1+deb13u4 | DEBIAN-CVE-2026-66140 |
| Debian:14 | exim4 | 4.99.4-2 | DEBIAN-CVE-2026-66140 |
| Ubuntu:22.04:LTS | exim4 | 4.95-4ubuntu2.11 | UBUNTU-CVE-2026-66140 |
| Ubuntu:24.04:LTS | exim4 | 4.97-4ubuntu4.7 | UBUNTU-CVE-2026-66140 |
| Ubuntu:26.04:LTS | exim4 | 4.99.1-1ubuntu1.4 | UBUNTU-CVE-2026-66140 |
Affected products (as reported)
Weakness: CWE-24 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H