CVE-2026-10650 warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumption
Remote attackers can cause resource consumption in libwebsockets SSH protocol handler via manipulated message length, requiring a patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10650?
CVE-2026-10650 is a medium-severity denial of service vulnerability in warmcat libwebsockets, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-10650?
How do I fix CVE-2026-10650?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-10650 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10650 exists.
Sources
Also known as DEBIAN-CVE-2026-10650, GHSA-23jv-8gf4-7r88, MGASA-2026-0442, OESA-2026-2668, UBUNTU-CVE-2026-10650.