Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage
GHSA-6jxj-px6v-747w · CVE-2026-61846
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Description
Impact
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.
Patches
This is fixed in Crass 1.0.7, which adds a configurable depth limit with a conservative default.
Workarounds
Add SystemStackError handling around Crass calls in your application. Buy more RAM.
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