CVE-2026-10650

warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumption

State: Published
Severity: 6.9 Medium
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: Jun 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
3.0	5.3 Medium	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
2.0	5.0 Medium	AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-400 Resource Consumption
CWE-404 Denial of Service

Affected Products

Product	Versions
libwebsocketswarmcat	4.5.0Affected 4.5.1Affected 4.5.2Affected 4.5.3Affected 4.5.4Affected 4.5.5Affected 4.5.6Affected 4.5.7Affected 4.5.8Affected

References

VDB-367955 | warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumptionvdb-entrytechnical-description
VDB-367955 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
CVE-2026-10650 | CVE Analysis and Reportthird-party-advisory
Submit #830261 | warmcat libwebsockets 4.5.99-v4.5.0-382-g4a63b9333 Uncontrolled Memory Allocationthird-party-advisory
https://github.com/biniamf/pocs/tree/main/libwebsockets_sshd-parse-ic-unbounded-allocexploit
https://github.com/biniamf/pocs/blob/main/libwebsockets_sshd-parse-ic-unbounded-alloc/poc_sshd_unbounded_alloc.pyexploit
https://github.com/warmcat/libwebsockets/commit/3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498patch
https://github.com/warmcat/libwebsockets/product

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