| Name | CVE-2026-19931 |
| Description | A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection. |
| 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) | bookworm | 7.88.1-10+deb12u15 | vulnerable |
| bookworm (security) | 7.88.1-10+deb12u5 | vulnerable |
| trixie | 8.14.1-2+deb13u5 | vulnerable |
| forky | 8.21.0-2 | vulnerable |
| sid | 8.22.0-1 | 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) | 8.22.0~rc2-1 | | | |
Notes
[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <postponed> (Minor issue)
https://curl.se/docs/CVE-2026-19931.html
Introduced with: https://github.com/curl/curl/commit/6c6035532383e300c712e4c1cd9fdd749ed5cf59 (curl-7_64_1)
Fixed by: https://github.com/curl/curl/commit/7103a93b05bc69ea98ed9d05d02fa9eeba533f2f (rc-8_22_0-2)