{"@context":"https://openvex.dev/ns/v0.2.0","@id":"https://database.harborguard.co/cve/CVE-2026-53753/vex.json","author":"HarborGuard Database","role":"Document Creator","timestamp":"2026-06-23T18:55:22.278Z","version":1,"tooling":"HarborGuard Database (https://database.harborguard.co)","statements":[{"vulnerability":{"name":"CVE-2026-53753","@id":"https://www.cve.org/CVERecord?id=CVE-2026-53753","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 wi"},"products":[{"@id":"cpe:2.3:a:unclecode:crawl4ai:\\<_0.8.7:*:*:*:*:*:*:*","identifiers":{"cpe23":"cpe:2.3:a:unclecode:crawl4ai:\\<_0.8.7:*:*:*:*:*:*:*"}}],"status":"affected","action_statement":"No fixed version is published yet; monitor the upstream advisory.","timestamp":"2026-06-23T18:55:22.278Z"}]}