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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2026-10650 NameCVE-2026-10650 DescriptionA 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…
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
Apply commands
https://github.com/biniamf/pocs/tree/main/libwebsockets_sshd-parse-ic-unbounded-allochttps://libwebsockets.org/git/libwebsockets/commit?id=3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498OS impact
Debian Affected 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Affected | — |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
- https://github.com/biniamf/pocs/blob/main/libwebsockets_sshd-parse-ic-unbounded-alloc/poc_sshd_unbounded_alloc.py
- https://github.com/biniamf/pocs/tree/main/libwebsockets_sshd-parse-ic-unbounded-alloc
- https://github.com/warmcat/libwebsockets/
- https://github.com/warmcat/libwebsockets/commit/3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498
- https://vuldb.com/cve/CVE-2026-10650
- https://vuldb.com/submit/830261
- https://vuldb.com/vuln/367955
- https://vuldb.com/vuln/367955/cti
- https://security-tracker.debian.org/tracker/CVE-2026-10650
CWEs
CWE-400 CWE-404
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.