{"id":"CVE-2023-22795","aliases":["GHSA-8xww-x3g3-6jcv"],"url":"https://o3.security/vulnerability/CVE-2023-22795","summary":"ReDoS based DoS vulnerability in Action Dispatch","details":"A regular expression based DoS vulnerability in Action Dispatch <6.1.7.1 and <7.0.4.1 related to the If-None-Match header. A specially crafted HTTP If-None-Match header can cause the regular expression engine to enter a state of catastrophic backtracking, when on a version of Ruby below 3.2.0. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately.","published":"2023-02-09T00:00:00Z","modified":"2026-09-09T03:30:45.805886733Z","cvss":null,"epss":{"score":0.02278,"percentile":0.81565,"asOf":"2026-08-13"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"actionpack","fixedVersion":"6.1.7.1"},{"ecosystem":"RubyGems","name":"actionpack","fixedVersion":"7.0.4.1"}],"fix":null,"references":[{"type":"WEB","url":"https://discuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/22xxx/CVE-2023-22795.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-22795"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240202-0010/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5372"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-09T03:30:45.805886733Z"}}