What’s Vulnerable › Vulnerabilities

CVE-2024-26142: Rails possible ReDoS vulnerability in Accept header parsing in Action Dispatch

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-27 · updated 2026-06-17
• Weakness: CWE-1333

Description

Rails is a web-application framework. Starting in version 7.1.0, there is a possible ReDoS vulnerability in the Accept header parsing routines of Action Dispatch. This vulnerability is patched in 7.1.3.1. Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected.

Affected products

• Ruby on Rails: from 7.1.0 before 7.1.3.1 — fixed in 7.1.3.1

How to fix

Upgrade to a fixed version: Ruby on Rails 7.1.3.1. Check the vendor advisory for mitigations.

References

• https://discuss.rubyonrails.org/t/possible-redos-vulnerability-in-accept-header-parsing-in-action-dispatch/84946
• https://github.com/rails/rails/commit/b4d3bfb5ed8a5b5a90aad3a3b28860c7a931e272
• https://github.com/rails/rails/security/advisories/GHSA-jjhx-jhvp-74wq
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2024-26142.yml
• https://security.netapp.com/advisory/ntap-20240503-0003/
• https://discuss.rubyonrails.org/t/possible-redos-vulnerability-in-accept-header-parsing-in-action-dispatch/84946
• https://github.com/rails/rails/commit/b4d3bfb5ed8a5b5a90aad3a3b28860c7a931e272
• https://github.com/rails/rails/security/advisories/GHSA-jjhx-jhvp-74wq
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2024-26142.yml
• https://security.netapp.com/advisory/ntap-20240503-0003/

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