GHSA-qxjp-w3pj-48m7: crawl4ai (CVE-2026-53753)

Package	Ecosystem	Affected	Fixed in
crawl4ai	PyPI	<0.8.7	0.8.7

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Crawl4AI versions before 0.8.7 are vulnerable to a sandbox escape in the computed fields feature of the Docker API: the AST validator fails to block generator and frame attributes such as gi_frame and f_back. An unauthenticated attacker, who needs no login because JWT is disabled by default, can send a crafted POST /crawl request and execute arbitrary commands in the container. Upgrade to version 0.8.7 or later; alternatively, enable JWT authentication via CRAWL4AI_API_TOKEN and restrict network access to the Docker API.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.029, the 86th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:42 UTC First seen by agentprime
31 Oct 2026, 14:42 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.