Medium 5.3Published Jan 8, 2026

CVE-2025-14819OpenSSL partial chain store policy bypass

Updated under an hour ago (Oct 27, 2026, 8:00 AM ET)

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It affects curl and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-295
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: curl
NVD analysis: Modified
Record last updated: Sep 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

curl curl curl:curl (from the name)	from 7.87.0 before 8.14.2; from 8.15.0 before 8.16.1; from 8.17.0 before 8.18.0	CNA record
haxx curl haxx:curl	from 7.87.0 before 8.18.0	NVD

References

References

https://curl.se/docs/CVE-2025-14819.json	vendor-advisory
https://curl.se/docs/CVE-2025-14819.html	mitigation, patch, vendor-advisory
http://www.openwall.com/lists/oss-security/2026/01/07/5	mailing-list, mitigation, patch, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.