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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.

PUBLISHED Reserved 2026-06-02 | Published 2026-06-02 | Updated 2026-06-03 | Assigner VulDB




MEDIUM: 6.9CVSS: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
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
5.0AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

Resource Consumption

Denial of Service

Product status

4.5.0
affected

4.5.1
affected

4.5.2
affected

4.5.3
affected

4.5.4
affected

4.5.5
affected

4.5.6
affected

4.5.7
affected

4.5.8
affected

Timeline

2026-06-02:Advisory disclosed
2026-06-02:VulDB entry created
2026-06-02:VulDB entry last update

Credits

biniam (VulDB User) reporter

References

vuldb.com/vuln/367955 (VDB-367955 | warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumption) vdb-entry technical-description

vuldb.com/vuln/367955/cti (VDB-367955 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/cve/CVE-2026-10650 (CVE-2026-10650 | CVE Analysis and Report) third-party-advisory

vuldb.com/submit/830261 (Submit #830261 | warmcat libwebsockets 4.5.99-v4.5.0-382-g4a63b9333 Uncontrolled Memory Allocation) third-party-advisory

github.com/...in/libwebsockets_sshd-parse-ic-unbounded-alloc exploit

github.com/...ic-unbounded-alloc/poc_sshd_unbounded_alloc.py exploit

github.com/...ommit/3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498 patch

github.com/warmcat/libwebsockets/ product

cve.org (CVE-2026-10650)

nvd.nist.gov (CVE-2026-10650)

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