What is CVE-2026-53753?

CVE-2026-53753 is a critical-severity vulnerability in Unclecode 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.

RCE in Unclecode 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)

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

Unclecode Crawl4ai — versions < 0.8.7

Weakness classification (CWE)

CWE-94 — Code Injection
CWE-913 — Improper Control of Dynamically-Managed Code Resources

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53753?: CVE-2026-53753 is a critical-severity vulnerability in Unclecode 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.