CVE-2026-53753: falha crítica em unclecode crawl4ai
Crawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker API
Publicada em
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63Vexday Risk Score
Corrija em breve. Ela tem exploit funcional público.
ssvc Attendcvss 9.8epss 2.9%
da publicação à arma6 dias
Publicada no NVD23 de jun.
1ª PoC+6d
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Produtos afetados
unclecode · crawl4aiPoCs públicas encontradas — 3
githubgithub.com/0xEnc0der/CVE-2026-53753★ 0githubgithub.com/thecodeb0ss/Advanced-CVE-2026-53753★ 0githubgithub.com/BiiTts/CVE-2026-53753-Crawl4AI-RCE★ 0⚠ Recursos públicos, para você avaliar a exposição de sistemas que controla ou está autorizado a testar. Teste apenas com autorização.
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