Vulnerability in Exim

CVE-2026-66140

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.5% 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-2026-66140: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • Exim — versions 4.88

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-66140?
CVE-2026-66140 is a high-severity vulnerability in Exim, classified under CWE-24. CVSS score: 8.4/10. Published 2026-07-24.
How severe is CVE-2026-66140?
High severity. CVSS v3 base score is 8.4 out of 10.