| Name | CVE-2026-15711 |
| Description | A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 ยง5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets. |
| 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) |
| Debian Bugs | 1142840 |
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 | vulnerable | |
| trixie | 2.74.3-10.1 | vulnerable | |
| libsoup3 (PTS) | bookworm | 3.2.3-0+deb12u2 | vulnerable |
| trixie | 3.6.5-3 | vulnerable | |
| forky, sid | 3.6.6-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| libsoup2.4 | source | (unstable) | (unfixed) | |||
| libsoup3 | source | (unstable) | (unfixed) | 1142840 |
https://bugzilla.redhat.com/show_bug.cgi?id=2499924
https://gitlab.gnome.org/GNOME/libsoup/-/issues/515