GMS-2019-76: Regular Expression Denial of Service in clean-css

June 5, 2019 (updated August 31, 2020)

Version of clean-css prior to 4.1.11 are vulnerable to Regular Expression Denial of Service (ReDoS). Untrusted input may cause catastrophic backtracking while matching regular expressions. This can cause the application to be unresponsive leading to Denial of Service.

Recommendation

Upgrade to version 4.1.11 or higher.

References

github.com/advisories/GHSA-wxhq-pm8v-cw75
github.com/jakubpawlowicz/clean-css/commit/2929bafbf8cdf7dccb24e0949c70833764fa87e3

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