CVE-2026-10650

Name	CVE-2026-10650
Description	A flaw has been found in warmcat libwebsockets up to 4.5.8. This issue affects the function lws_ssh_parse_plaintext of the file plugins/protocol_lws_ssh_base/sshd.c of the component SSH Protocol Handler. Executing a manipulation of the argument msg_len can lead to resource consumption. The attack may be launched remotely. The exploit has been published and may be used. This patch is called 3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498. A patch should be applied to remediate this issue.
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
libwebsockets (PTS)	bullseye	4.0.20-2	vulnerable
	bullseye (security)	4.0.20-2+deb11u1	vulnerable
	bookworm	4.1.6-3	vulnerable
	trixie	4.3.5-1+deb13u1	vulnerable
	forky, sid	4.3.5-4.1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libwebsockets	source	(unstable)	(unfixed)

Notes

https://github.com/biniamf/pocs/tree/main/libwebsockets_sshd-parse-ic-unbounded-alloc
https://libwebsockets.org/git/libwebsockets/commit?id=3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498