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.
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Advisories
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-qxjp-w3pj-48m7 | Crawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker API |
Fixes
Solution
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Workaround
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References
History
Tue, 23 Jun 2026 20:30:00 +0000
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| Metrics |
ssvc
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Tue, 23 Jun 2026 19:00:00 +0000
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| 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. | |
| Title | Crawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker API | |
| Weaknesses | CWE-913 CWE-94 |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-23T18:55:22.278Z
Reserved: 2026-06-10T17:48:40.546Z
Link: CVE-2026-53753
Updated: 2026-06-23T18:54:09.147Z
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OpenCVE Enrichment
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Github GHSA