CVE-2026-109239: Crawl4AI before 0.9.4 Blind SSRF via RobotsParser.can_fetch robots.txt Fetch

Severity: medium (CVSS 5.3 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: 2026-10-12 · updated 2026-10-16
Weakness: CWE-918

Description

Crawl4AI before 0.9.4 contains a blind server-side request forgery vulnerability in RobotsParser.can_fetch that lets unauthenticated attackers bypass Docker server egress controls. Attackers can enable check_robots_txt and use redirects or DNS rebinding to reach internal, loopback, or cloud-metadata addresses for service discovery.

Affected products

unclecode crawl4ai: before 0.9.4 — fixed in 0.9.4

How to fix

Upgrade to a fixed version: unclecode crawl4ai 0.9.4. Check the vendor advisory for mitigations.

References

https://github.com/unclecode/crawl4ai/security/advisories/GHSA-f77g-77vp-r96v
https://www.vulncheck.com/advisories/crawl4ai-before-0.9.4-blind-ssrf-via-robotsparser-can-fetch-robots-txt-fetch

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