CVE-2021-22902: Uncontrolled Resource Consumption

June 11, 2021 (updated August 18, 2021)

There is a possible Denial of Service vulnerability in Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine.

References

groups.google.com/g/rubyonrails-security/c/_5ID_ld9u1c
nvd.nist.gov/vuln/detail/CVE-2021-22902

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