What’s Vulnerable › Vulnerabilities

CVE-2026-10650: warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumption

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-02 · updated 2026-07-22
• Weakness: CWE-400

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.

Affected products

• warmcat libwebsockets: 4.5.0, 4.5.1, 4.5.2, 4.5.3, 4.5.4, 4.5.5 (+3)

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

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