What is CVE-2026-22178?

CVE-2026-22178 is a medium-severity vulnerability in Openclaw, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-03-18.

How severe is CVE-2026-22178?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Openclaw

CVE-2026-22178

OpenClaw versions prior to 2026.2.19 construct RegExp objects directly from unescaped Feishu mention metadata in the stripBotMention function, allowing regex injection and denial of service. Attackers can craft nested-quantifier patterns or metacharacters in mention metadata to trigger catastrophic backtracking, block message processing, or remove unintended content before model processing.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

EPSS: 0.003 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Openclaw — versions 0, 2026.2.19

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

disclosure@vulncheck.com (vendor-advisory, Vendor Advisory, third-party-advisory)
disclosure@vulncheck.com (Patch, patch)
disclosure@vulncheck.com (Patch, patch)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-22178?: CVE-2026-22178 is a medium-severity vulnerability in Openclaw, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-03-18.
How severe is CVE-2026-22178?: Medium severity. CVSS v3 base score is 6.5 out of 10.