CVE-2023-22796: Inefficient Regular Expression Complexity

February 9, 2023 (updated February 2, 2024)

A regular expression based DoS vulnerability in Active Support <6.1.7.1 and <7.0.4.1. A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.

References

discuss.rubyonrails.org/t/cve-2023-22796-possible-redos-based-dos-vulnerability-in-active-supports-underscore/82116
github.com/advisories/GHSA-j6gc-792m-qgm2
github.com/rails/rails/releases/tag/v7.0.4.1
nvd.nist.gov/vuln/detail/CVE-2023-22796

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