Vulnerability in Exim

CVE-2026-66141

Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-66141: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

  • Exim — versions 4.82

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-66141?
CVE-2026-66141 is a high-severity vulnerability in Exim, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.4/10. Published 2026-07-24.
How severe is CVE-2026-66141?
High severity. CVSS v3 base score is 7.4 out of 10.