---
id: CVE-2025-14819
title: |-
  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
summary: |-
  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. Contra…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-295
vendor: haxx
product: curl
affected:
  - 'curl >= 7.87.0, < 8.18.0'
patched:
  - curl 8.18.0
published: '2026-01-08'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T07:16:24.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-14819'
references:
  - url: 'https://curl.se/docs/CVE-2025-14819.html'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://curl.se/docs/CVE-2025-14819.json'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'http://www.openwall.com/lists/oss-security/2026/01/07/5'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-01-08T15:00:02.949618Z'
epss: 0.00739
epssPercentile: 0.52563
ingestedAt: '2026-09-15T07:33:29.259Z'
---

## Overview

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.

## Affected

- `curl >= 7.87.0, < 8.18.0`

## Remediation

Upgrade past the affected range:

- `curl 8.18.0`