CVE-2023-22795

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.

• CWE-400
• CWE-1333

• https://discuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118Patch, Vendor Advisory
• https://security.netapp.com/advisory/ntap-20240202-0010/
• https://www.debian.org/security/2023/dsa-5372Third Party Advisory
• https://discuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118Patch, Vendor Advisory
• https://security.netapp.com/advisory/ntap-20240202-0010/
• https://www.debian.org/security/2023/dsa-5372Third Party Advisory

Published

Feb 9, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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