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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (21.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Openclaw — versions 0, 2026.2.19
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-c6hr-w26q-c636 (vendor-advisory, Vendor Advisory, third-party-advisory)
- github.com/openclaw/openclaw/commit/7e67ab75cc2f0e93569d12fecd1411c2961fcc8c (Patch, patch)
- github.com/openclaw/openclaw/commit/74268489137510b6f6349919d1e197b17290d92c (Patch, patch)
- www.vulncheck.com/advisories/openclaw-redos-and-regex-injection-via-unescaped-f… (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.