| Name | CVE-2025-4476 |
| Description | A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1105887, 1107757 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libsoup2.4 (PTS) | bullseye | 2.72.0-2 | vulnerable |
| bullseye (security) | 2.72.0-2+deb11u2 | vulnerable |
| bookworm | 2.74.3-1+deb12u1 | vulnerable |
| sid, trixie | 2.74.3-10.1 | vulnerable |
| libsoup3 (PTS) | bookworm | 3.2.2-2 | vulnerable |
| sid, trixie | 3.6.5-1 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[bookworm] - libsoup3 <no-dsa> (Minor issue)
[bookworm] - libsoup2.4 <no-dsa> (Minor issue)
https://gitlab.gnome.org/GNOME/libsoup/-/issues/440
https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/457
Fixed by: https://gitlab.gnome.org/GNOME/libsoup/-/commit/e64c221f9c7d09b48b610c5626b3b8c400f0907c
https://bugzilla.redhat.com/show_bug.cgi?id=2366513