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.

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.

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.

Affected products

Exim — versions 4.88

Weakness classification (CWE)

CWE-24

References

cve@mitre.org

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.