Description
libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.
References
https://curl.se/docs/CVE-2026-8458.html
https://curl.se/docs/CVE-2026-8458.json
https://hackerone.com/reports/3721183
https://hackerone.com/reports/3721183
Weaknesses
2499f714-1537-4658-8207-48ae4bb9eae9
CVSS impact metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5 · Medium
Information
Source identifier
2499f714-1537-4658-8207-48ae4bb9eae9
Vulnerability status
Modified
Published
2026-07-03T07:16:24.630Z
3 months agoLast modified
2026-09-15T07:16:32.327Z
3 weeks ago