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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00036.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Curl Subscribe
Curl Subscribe
Haxx Subscribe
Curl Subscribe

Configuration 1 [-]

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Curl Subscribe
Curl Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://www.openwall.com/lists/oss-security/2026/01/07/5 cve-icon
https://curl.se/docs/CVE-2025-14819.html cve-icon cve-icon
https://curl.se/docs/CVE-2025-14819.json cve-icon cve-icon
History

Wed, 21 Jan 2026 00:00:00 +0900

Type Values Removed Values Added
First Time appeared Haxx
Haxx curl
CPEs cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
Vendors & Products Haxx
Haxx curl

Fri, 09 Jan 2026 22:30:00 +0900

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Fri, 09 Jan 2026 03:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 09 Jan 2026 00:30:00 +0900

Type Values Removed Values Added
Weaknesses CWE-295
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Thu, 08 Jan 2026 20:30:00 +0900

Type Values Removed Values Added
References

Thu, 08 Jan 2026 19:15:00 +0900

Type Values Removed Values Added
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.
Title OpenSSL partial chain store policy bypass
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

Updated: 2026-01-08T15:02:04.303Z

Reserved: 2025-12-17T09:55:27.969Z

Link: CVE-2025-14819

cve-icon Vulnrichment

Updated: 2026-01-08T11:06:19.910Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-08T10:15:46.730

Modified: 2026-01-20T14:51:26.263

Link: CVE-2025-14819

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-09T22:25:44Z

Weaknesses