CVE-2025-14819

low-risk

Published 2026-01-08

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.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

NETWORK / HIGH complexity

Affected Products (1)

Curl

Affected Vendors

Haxx

References (3)

Vendor Advisory https://curl.se/docs/CVE-2025-14819.html

Vendor Advisory https://curl.se/docs/CVE-2025-14819.json

Mailing List http://www.openwall.com/lists/oss-security/2026/01/07/5

/ 100

low-risk

Severity 17/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal