GHSA-r253-r9jw-qg44: Crawl4AI: Unauthenticated RCE via Chromium launch-argument injection in browser_config.extra_args

The Docker API server accepted a request-supplied browser_config.extra_args, which flowed into Chromium’s launch arguments. An attacker could inject Chromium switches that replace a child-process launch command (--utility-cmd-prefix, --renderer-cmd-prefix, --gpu-launcher, --browser-subprocess-path) together with --no-zygote, causing Chromium to fork/exec an attacker-controlled command as the container’s runtime user. The Docker API is unauthenticated by default, so a single request yields arbitrary command execution.

The earlier extra_args SSRF patch (0.8.9) used a denylist scoped to proxy/DNS flags; a denylist of launch switches is inherently incomplete, and these command-execution switches were not covered.