[CVE-2022-44570] Possible Denial of Service Vulnerability in Rack's Range header parsing

There is a possible denial of service vulnerability in the Range header parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-44570.

Versions Affected: >= 1.5.0 Not affected: None. Fixed Versions:,,,


Carefully crafted input can cause the Range header parsing component in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that deal with Range requests (such as streaming applications, or applications that serve files) may be impacted.


The fixed releases are available at the normal locations.


There are no feasible workarounds for this issue.


To aid users who aren’t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.

  • 2-0-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch - Patch for 2.0 series
  • 2-1-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch - Patch for 2.1 series
  • 2-2-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch - Patch for 2.2 series
  • 3-0-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch - Patch for 3.0 series


Thank you ooooooo_q for reporting this!

3-0-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch (1.3 KB) 2-1-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch (1.3 KB) 2-0-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch (1.3 KB) 2-2-Fix-ReDoS-in-Rack-Utils.get_byte_ranges.patch (1.3 KB)