What is CVE-2025-14819?

CVE-2025-14819 is a medium-severity vulnerability in Curl, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-01-08.

How severe is CVE-2025-14819?

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

Vulnerability in Curl

CVE-2025-14819

When doing TLS related transfers with reused easy or multi handles and altering the `CURLSSLOPT_NO_PARTIALCHAIN` option, libcurl could accidentally reuse a CA store cached in memory for which the partial chain option was reversed. Contrary to the user's wishes and expectations. This could make libcurl find and accept a trust chain that it otherwise would not.

Vulnerability class: Improper Certificate Validation

Published 2026-01-08 · last modified 2026-09-15.

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.

EPSS exploit prediction

EPSS: 0.007 (52.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Curl — versions 8.17.0, 8.16.0, 8.15.0
Haxx Curl

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

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

Frequently asked questions

What is CVE-2025-14819?: CVE-2025-14819 is a medium-severity vulnerability in Curl, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-01-08.
How severe is CVE-2025-14819?: Medium severity. CVSS v3 base score is 5.3 out of 10.