Crawl4AI 0.7.0 before 0.9.5 contains an inefficient regular expression complexity vulnerability in the Docker API server that allows authenticated API clients to supply unbounded regular expressions in /crawl request bodies. Attackers can submit catastrophic-backtracking patterns via RegexExtractionStrategy.custom, RegexChunking.patterns or JsonCss, JsonXPath and JsonLxml schema regex fields against a crafted page to freeze the entire server, including /health.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
unclecode:crawl4ai
References 5
https://github.com/unclecode/crawl4ai/security/advisories/GHSA-j843-8p47-rhxp
GitHub Security Advisory (GHSA-j843-8p47-rhxp)
https://github.com/unclecode/crawl4ai/commit/8aea2006e2cdb96a185e50b20633fc323d…
NVD
https://github.com/unclecode/crawl4ai/releases/tag/v0.9.5
crawl4ai v0.9.5 Release Notes
https://github.com/unclecode/crawl4ai
NVD
https://www.vulncheck.com/advisories/crawl4ai-0.7.0-before-0.9.5-redos-via-craw…
VulnCheck Advisory: Crawl4AI 0.7.0 before 0.9.5 ReDoS via /crawl Regex Fields