What’s Vulnerable › Vulnerabilities

CVE-2026-115508: Crawl4AI 0.7.0 before 0.9.5 ReDoS via /crawl Regex Fields

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-29
• Weakness: CWE-1333

Description

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.

Affected products

• unclecode crawl4ai: from 0.7.0 before 0.9.5 — fixed in 0.9.5

How to fix

Upgrade to a fixed version: unclecode crawl4ai 0.9.5. Check the vendor advisory for mitigations.

References

• https://github.com/unclecode/crawl4ai
• https://github.com/unclecode/crawl4ai/commit/8aea2006e2cdb96a185e50b20633fc323dff6429
• https://github.com/unclecode/crawl4ai/releases/tag/v0.9.5
• https://github.com/unclecode/crawl4ai/security/advisories/GHSA-j843-8p47-rhxp
• https://www.vulncheck.com/advisories/crawl4ai-0.7.0-before-0.9.5-redos-via-crawl-regex-fields
• https://github.com/unclecode/crawl4ai/security/advisories/GHSA-j843-8p47-rhxp

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