Description
Action Pack is a framework for handling and responding to web requests. Starting in version 4.0.0 and prior to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, and 7.2.1.1, there is a possible ReDoS vulnerability in Action Controller's HTTP Token authentication. For applications using HTTP Token authentication via `authenticate_or_request_with_http_token` or similar, a carefully crafted header may cause header parsing to take an unexpected amount of time, possibly resulting in a DoS vulnerability. All users running an affected release should either upgrade to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, or 7.2.1.1 or apply the relevant patch immediately. One may choose to use Ruby 3.2 as a workaround.Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected. Rails 8.0.0.beta1 depends on Ruby 3.2 or greater so is unaffected.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rails | rails | >= 4.0.0, < 6.1.7.9, >= 7.0.0, < 7.0.8.5, >= 7.1.0, < 7.1.4.1, >= 7.2.0, < 7.2.1.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rails | 2:7.2.2.1+dfsg-1 | — |
| Debian 13 | rails | 2:7.2.2.1+dfsg-1 | — |
| Debian 12 | rails | 2:6.1.7.10+dfsg-1~deb12u1 | DSA-5881-1 |
| Debian 11 | rails | 2:6.0.3.7+dfsg-2+deb11u3 | DLA-4383-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rails | No fix yet | — |
| Ubuntu 26.04 LTS | rails | No fix yet | — |
| Ubuntu 25.10 | rails | No fix yet | — |
| Ubuntu 24.04 LTS | rails | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | rails | 2:6.1.4.1+dfsg-8ubuntu2+esm1 | USN-7290-1 |
| Ubuntu Pro 20.04 LTS | rails | 2:5.2.3+dfsg-3ubuntu0.1~esm1 | USN-7290-1 |
| Ubuntu Pro 18.04 LTS | rails | 2:4.2.10-0ubuntu4+esm1 | USN-7290-1 |
| Ubuntu Pro 16.04 LTS | rails | 2:4.2.6-1ubuntu0.1~esm1 | USN-7290-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | rubygem-actionpack-5_1 | 5.1.4-150000.3.32.1 | SUSE-SU-2024:3877-1 |
| SLES 15 SP5 | rubygem-actionpack-5_1 | 5.1.4-150000.3.32.1 | SUSE-SU-2024:3877-1 |
| SLES 15 SP4 | rubygem-actionpack-5_1 | 5.1.4-150000.3.32.1 | SUSE-SU-2024:3877-1 |
| SLES 15 SP3 | rubygem-actionpack-5_1 | 5.1.4-150000.3.32.1 | SUSE-SU-2024:3877-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | rubygem-rails-7.0 +1 | 7.0.8.6-1.1 | openSUSE-SU-2025:15124-1, openSUSE-SU-2025:15110-1, openSUSE-SU-2024:14479-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | actionpack | >= 4.0.0, < 6.1.7.9 | 6.1.7.9 | GHSA-vfg9-r3fq-jvx4 |
| RubyGems | actionpack | >= 7.0.0, < 7.0.8.5 | 7.0.8.5 | GHSA-vfg9-r3fq-jvx4 |
| RubyGems | actionpack | >= 7.1.0, < 7.1.4.1 | 7.1.4.1 | GHSA-vfg9-r3fq-jvx4 |
| RubyGems | actionpack | >= 7.2.0, < 7.2.1.1 | 7.2.1.1 | GHSA-vfg9-r3fq-jvx4 |
Advisories 9
- USN-7290-1 rails vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DSA-5881-1 rails - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:15124-1 ruby3.4-rubygem-rails-7.0-7.0.8.6-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3877-1 Security update for rubygem-actionpack-5_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14472-1 ruby3.3-rubygem-actionpack-7.0-7.0.8.6-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14479-1 ruby3.3-rubygem-rails-7.0-7.0.8.6-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:15110-1 ruby3.4-rubygem-actionpack-7.0-7.0.8.6-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3205 Ruby on Rails: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 25, 2025
- DLA-4383-1 rails - security update Debian Security (DSA / DLA) · Nov 25, 2025
References
- https://github.com/rails/rails/security/advisories/GHSA-vfg9-r3fq-jvx4
- https://github.com/rails/rails/commit/56b2fc3302836405b496e196a8d5fc0195e55049
- https://github.com/rails/rails/commit/7c1398854d51f9bb193fb79f226647351133d08a
- https://github.com/rails/rails/commit/8e057db25bff1dc7a98e9ae72e0083825b9ac545
- https://github.com/rails/rails/commit/f4dc83d8926509d0958ec21fcdbc2e7df3d32ce2