Medium severity · published Jan 8, 2026
CVE-2025-14819
OpenSSL partial chain store policy bypass
5.3
CVSS
0.8%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
7.87.0 before 8.14.2; 8.15.0 before 8.16.1; 8.17.0 before 8.18.0; 3c16697ebd796f799227be293e8689aec5f8190d before cd046f6c93b39d673a58c18648d8906e954c4f5d; 8.17.0; 8.16.0; +29 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-14819
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-14819
Mitigation
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
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