Vulnerability advisory

GHSA-jjhx-jhvp-74wq

Rails has possible ReDoS vulnerability in Accept header parsing in Action Dispatch

Published Feb 27, 2024Updated Sep 10, 2026OSV record ↗

Also known as BIT-rails-2024-26142CVE-2024-26142

Severity

Severity not reported.

Affected versions

actionpack RubyGems

All actionpack advisories →

Affected	Fixed in
`7.1.0` to before 7.1.3.1	`7.1.3.1`Advisories →
Also listed as affected (4) `7.1.0` `7.1.1` `7.1.2` `7.1.3`

Description

Possible ReDoS vulnerability in Accept header parsing in Action Dispatch

There is a possible ReDoS vulnerability in the Accept header parsing routines of Action Dispatch. This vulnerability has been assigned the CVE identifier CVE-2024-26142.

Versions Affected: >= 7.1.0, < 7.1.3.1 Not affected: < 7.1.0 Fixed Versions: 7.1.3.1

Impact

Carefully crafted Accept headers can cause Accept header parsing in Action Dispatch to take an unexpected amount of time, possibly resulting in a DoS vulnerability. All users running an affected release should either upgrade or use one of the workarounds immediately.

Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected.

Releases

The fixed releases are available at the normal locations.

Workarounds

There are no feasible workarounds for this issue.

Patches

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.

7-1-accept-redox.patch - Patch for 7.1 series

Credits

Thanks svalkanov for the report and patch!