| Name | CVE-2026-8458 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| curl (PTS) | bullseye | 7.74.0-1.3+deb11u13 | vulnerable |
| bullseye (security) | 7.74.0-1.3+deb11u16 | vulnerable |
| bookworm | 7.88.1-10+deb12u15 | vulnerable |
| bookworm (security) | 7.88.1-10+deb12u5 | vulnerable |
| trixie | 8.14.1-2+deb13u4 | vulnerable |
| forky | 8.20.0-5 | vulnerable |
| sid | 8.21.0-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | (unstable) | 8.21.0~rc2-1 | | | |
Notes
[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <postponed> (Minor issue; needs HTTP Negotiate auth with differing service names)
[bullseye] - curl <postponed> (Minor issue; needs HTTP Negotiate auth with differing service names)
https://curl.se/docs/CVE-2026-8458.html
Introduced with: https://github.com/curl/curl/commit/97c272e5d173ad5f706443e2477f0a84f0044edd (curl-7_43_0)
Fixed by: https://github.com/curl/curl/commit/5e99b73cf441d9c369768b9cd48b5389b9a2503d (rc-8_21_0-1, curl-8_21_0)