CVE-2026-53753 Scanner
CVE-2026-53753 Scanner - Remote Code Execution vulnerability in Crawl4AI
Used 2.2k times · 5.9k assets checked · domain, subdomain, ipv4
CVE
CVE-2026-53753
10.0
CVSScritical
Exploitable remotely over the internet · no authentication required.
Description
Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.7, the _safe_eval_expression() function in the computed fields feature uses an AST validator that only blocks attributes starting with underscore. Python generator and frame object attributes (gi_frame, f_back, f_builtins) do NOT start with underscore, enabling a complete sandbox escape to achieve arbitrary code execution. The attack requires no authentication (JWT disabled by default) and is triggered via POST /crawl with a crafted extraction schema. This vulnerability is fixed in 0.8.7.
Attack Vector
Network
Privileges Req.
None
User Interaction
None
crawl4ai
Updated Sep 18, 2026View on NVD →
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CVE history: crawl4ai
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