CVE-2025-14819 | OpenSSL partial chain store policy bypass

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.

Published: 2026-01-08 Last update: 2026-01-20 Assigner: 2499f714-1537-4658-8207-48ae4bb9eae9 Source: 2499f714-1537-4658-8207-48ae4bb9eae9
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-14819 is rated Low Risk (24.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.03%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-14819

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-05 0.06% 0.03% -0.03%
2 2026-05-10 0.01% 0.06% +0.05%
3 2026-01-08 — 0.01% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-14819

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.6 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-14819

OS Trackers for CVE-2025-14819

vendor priority summary link
alpine — CVE-2025-14819: 1 source package rows (curl); 280 state rows across 6 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 1, open 279. https://security.alpinelinux.org/vuln/CVE-2025-14819
debian unimportant CVE-2025-14819 unimportant priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2025-14819
redhat low — https://access.redhat.com/security/cve/CVE-2025-14819
suse medium CVE-2025-14819 severity moderate: SUSE including 340 source package names (1.1.0-1.7:libcurl4-8.14.1-150700.7.8.1, 13.2-9.56:curl-8.14.1-slfo.1.1_4.1, …), 827 product×package rows across 248 product lines (Container private-registry/harbor-trivy-adapter, Container suse/ltss/sle12.5/sles12sp5, … (248 product lines)): Fixed 573, Known Affected 231, Known Not Affected 17, First Fixed 6. https://www.suse.com/security/cve/CVE-2025-14819/
ubuntu low CVE-2025-14819 low priority: Ubuntu including 1 source packages (curl), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 5, released 3, ignored 1. https://ubuntu.com/security/CVE-2025-14819

Affected software / configurations for CVE-2025-14819

Vendor Product Version Raw CPE
haxx curl >= 7.87.0, < 8.18.0 cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

References for CVE-2025-14819

URL Tags
https://curl.se/docs/CVE-2025-14819.html Vendor Advisory Mitigation Patch
https://curl.se/docs/CVE-2025-14819.json Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/01/07/5 Mailing List Third Party Advisory Mitigation Patch
cvelogic Threat Intelligence