5.3Medium
Haxx Curl
CVE-2025-14819
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.
What this means for your business
- It affects Haxx Curl. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, but only after tricking someone into an action such as opening a file or a link.
- FIRST's prediction model gives it a 0.7% chance of attack attempts being seen in the next 30 days, ranking above 53% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Haxx Curl, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 5.3 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N- Weakness
- CWE-295
- Assigned by
- 2499f714-1537-4658-8207-48ae4bb9eae9
Dates
- Published
- 2026-01-08
- Last modified
- 2026-09-15
- Sources
- NVD
Affected products
- Haxx Curl7.87.0 - 8.18.0
As listed in the NVD configuration data. Not a statement about your estate.