What is CVE-2025-15079?

CVE-2025-15079 is a medium-severity vulnerability in Curl, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 5.3/10. Published 2026-01-08.

How severe is CVE-2025-15079?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Curl

CVE-2025-15079

When doing SSH-based transfers using either SCP or SFTP, and setting the known_hosts file, libcurl could still mistakenly accept connecting to hosts *not present* in the specified file if they were added as recognized in the libssh *global* known_hosts file.

EPSS: 0.005 (37.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Curl — versions 8.17.0, 8.16.0, 8.15.0
Haxx Curl

Weakness classification (CWE)

CWE-297 — Improper Validation of Certificate with Host Mismatch

References

2499f714-1537-4658-8207-48ae4bb9eae9 (Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Patch, Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Exploit, Third Party Advisory, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2025-15079?: CVE-2025-15079 is a medium-severity vulnerability in Curl, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 5.3/10. Published 2026-01-08.
How severe is CVE-2025-15079?: Medium severity. CVSS v3 base score is 5.3 out of 10.