ADVISORIES

• CVE-2023-27539 (NVD)
• GHSA-c6qg-cjj8-47qp
• Vendor Advisory

GEM

rack

PATCHED VERSIONS

• ~> 2.0, >= 2.2.6.4
• >= 3.0.6.1

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.