CVE-2025-14819

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://curl.se/docs/CVE-2025-14819.html ↗

Additional information

• NVD record
• https://curl.se/docs/CVE-2025-14819.htmlPatch
• http://www.openwall.com/lists/oss-security/2026/01/07/5Patch
• https://curl.se/docs/CVE-2025-14819.jsonAdvisory