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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: < 1.0.7
Patched in 1.0.7
Details
Crass recursively parses CSS simple blocks and functions without a depth guard. An attacker-controlled value containing many deeply nested blocks can recurse until Ruby raises SystemStackError: stack level too deep, or can cause excessive memory usage.
This is fixed in Crass 1.0.7, which adds a configurable depth limit with a conservative default.
Add SystemStackError handling around Crass calls in your application. Buy more RAM.
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Find out whether this dependency (or others like it) is actually reachable in your codebase.
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A secure code review or supply chain review finds this before an advisory does.