Inefficient regular expression complexity in OpenClaw - CVE-2026-22178
Published: May 4, 2026
Vulnerability identifier: #VU129400
CSH Severity: Medium
CVSS v4.0: 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:U/U:Green
CVE-ID: CVE-2026-22178
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in stripBotMention() in extensions/feishu/src/bot.ts when processing Feishu mention metadata in RegExp construction. A remote attacker can supply crafted mention metadata with nested quantifiers to cause a denial of service.
The issue can trigger catastrophic backtracking and block message processing.
How to mitigate CVE-2026-22178
Install security update from vendor's website.