CVE-2022-23517: Inefficient Regular Expression Complexity

December 14, 2022 (updated September 13, 2023)

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Certain configurations of rails-html-sanitizer < 1.4.4 use an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption. This issue has been patched in version 1.4.4.

References

github.com/advisories/GHSA-5x79-w82f-gw8w
github.com/rails/rails-html-sanitizer/commit/56c61c0cebd1e493e8ad7bca2a0191609a4a6979
github.com/rails/rails-html-sanitizer/security/advisories/GHSA-5x79-w82f-gw8w
hackerone.com/reports/1684163
nvd.nist.gov/vuln/detail/CVE-2022-23517

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