RCE in Kidocode Crawl4ai
CVE-2026-53753
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…
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.006 (45.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Kidocode Crawl4ai
- Unclecode Crawl4ai — versions < 0.8.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2026-53753?
- CVE-2026-53753 is a critical-severity vulnerability in Kidocode Crawl4ai, classified under Code Injection. CVSS score: 9.8/10. Published 2026-06-23.
- How severe is CVE-2026-53753?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-53753 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.