CVE-2026-109239: Server-Side Request Forgery (SSRF) in unclecode crawl4ai
Description
CVE-2026-109239 is a server-side request forgery (SSRF) vulnerability in crawl4ai versions before 0.9.4. It affects the RobotsParser.can_fetch function, allowing unauthenticated attackers to bypass Docker server egress controls. By enabling check_robots_txt and leveraging redirects or DNS rebinding, attackers can reach internal, loopback, or cloud metadata addresses for service discovery.
CVSS v4.0
Score 6.9medium
Affected software
unclecode
crawl4ai
pkg:github/unclecode/crawl4aiRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in crawl4ai before version 0.9.4 is a blind SSRF in the RobotsParser.can_fetch method. This flaw permits unauthenticated attackers to bypass Docker egress restrictions by enabling the check_robots_txt feature and exploiting redirects or DNS rebinding techniques. This enables attackers to access internal network resources, loopback interfaces, or cloud metadata endpoints, potentially facilitating service discovery within protected environments.
Potential Impact
An attacker can bypass Docker server egress controls to access internal, loopback, or cloud metadata addresses. This may lead to unauthorized service discovery within internal networks or cloud environments. The vulnerability is unauthenticated and remotely exploitable, increasing the risk of reconnaissance and potential follow-on attacks. However, no known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in crawl4ai version 0.9.4. Users should upgrade to version 0.9.4 or later to remediate this SSRF vulnerability. Until upgraded, disabling the check_robots_txt feature can mitigate exploitation risk by preventing the SSRF attack vector.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-12T14:07:56.520Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acd0c112cdf04f656b11be1
Added to database: 10/12/2026, 16:34:25 UTC
Last enriched: 10/12/2026, 17:19:27 UTC
Last updated: 10/12/2026, 21:46:59 UTC
Views: 2
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