| Name | CVE-2026-12549 |
| Description | The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding. |
| 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 |
|---|
| libsoup2.4 (PTS) | bullseye | 2.72.0-2 | vulnerable |
| bullseye (security) | 2.72.0-2+deb11u3 | vulnerable |
| bookworm | 2.74.3-1+deb12u1 | fixed |
| trixie | 2.74.3-10.1 | fixed |
| libsoup3 (PTS) | bookworm | 3.2.3-0+deb12u2 | fixed |
| trixie | 3.6.5-3 | fixed |
| forky, sid | 3.6.6-1 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[trixie] - libsoup3 <not-affected> (Incomplete fix for CVE-2026-2443 not released)
[bookworm] - libsoup3 <not-affected> (Incomplete fix for CVE-2026-2443 not released)
[trixie] - libsoup2.4 <not-affected> (Incomplete fix for CVE-2026-2443 not released)
[bookworm] - libsoup2.4 <not-affected> (Incomplete fix for CVE-2026-2443 not released)
https://bugzilla.redhat.com/show_bug.cgi?id=2489999
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516