- < 3.0.0
- ~> 5.2.8, >= 188.8.131.52
- ~> 6.1.7, >= 184.108.40.206
- >= 220.127.116.11
There is a possible regular expression based DoS vulnerability in Action Dispatch. This vulnerability has been assigned the CVE identifier CVE-2023-22792.
Versions Affected: >= 3.0.0 Not affected: < 3.0.0 Fixed Versions: 18.104.22.168 (Rails LTS), 22.214.171.124, 126.96.36.199
Specially crafted cookies, in combination with a specially crafted X_FORWARDED_HOST header 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 All users running an affected release should either upgrade or use one of the workarounds immediately.
We recommend that all users upgrade to one of the FIXED versions. In the meantime, users can mitigate this vulnerability by using a load balancer or other device to filter out malicious X_FORWARDED_HOST headers before they reach the application.