CVE-2023-27539.yml

---
gem: rack
cve: 2023-27539
ghsa: c6qg-cjj8-47qp
url: https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466
title: Possible Denial of Service Vulnerability in Rack’s header parsing
date: 2023-03-13
description: |
  There is a denial of service vulnerability in the header parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2023-27539.

  Versions Affected: >= 2.0.0 Not affected: None. Fixed Versions: 2.2.6.4, 3.0.6.1

  # Impact
  Carefully crafted input can cause header parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse headers using Rack (virtually all Rails applications) are impacted.

  # Workarounds
  Setting Regexp.timeout in Ruby 3.2 is a possible workaround.
patched_versions:
  - "~> 2.0, >= 2.2.6.4"
  - ">= 3.0.6.1"