CVE-2026-33174
CVE-2026-33174 · Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
CVSS 6.6 · Medium · EPSS 0.6% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
activestorage
- Versions
- >= 8.1.0.beta1, < 8.1.2.1: Affected
- >= 8.0.0.beta1, < 8.0.4.1: Affected
- < 7.2.3.1: Affected
No fix published
rails Debian:13
- Versions
- 2:7.2.2.1+dfsg-7
- 2:7.2.2.2+dfsg-1
- 2:7.2.2.2+dfsg-2~deb13u1
- Affected ranges
- ECOSYSTEM: < 2:7.2.2.2+dfsg-2~deb13u2
Update to 2:7.2.2.2+dfsg-2~deb13u2
rails Debian:14
- Versions
- 2:7.2.2.1+dfsg-7
- 2:7.2.2.2+dfsg-1
- 2:7.2.2.2+dfsg-2
- 2:7.2.2.2+dfsg-2~deb13u1
- 2:7.2.2.2+dfsg-2~deb13u2
- 2:7.2.3+dfsg-1
- 2:7.2.3+dfsg-2
- 2:7.2.3+dfsg-3
- Affected ranges
- ECOSYSTEM: < 2:7.2.3.1+dfsg-1
Update to 2:7.2.3.1+dfsg-1
rails Ubuntu:Pro:16.04:LTS
- Versions
- 2:4.1.10-1
- 2:4.2.5-1
- 2:4.2.5.1-1
- 2:4.2.5.2-2
- 2:4.2.6-1
- 2:4.2.6-1ubuntu0.1~esm1
- 2:4.2.6-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:Pro:18.04:LTS
- Versions
- 2:4.2.9-2
- 2:4.2.9-4
- 2:4.2.10-0ubuntu4
- 2:4.2.10-0ubuntu4+esm1
- 2:4.2.10-0ubuntu4+esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:Pro:20.04:LTS
- Versions
- 2:5.2.2.1+dfsg-1ubuntu1
- 2:5.2.3+dfsg-3
- 2:5.2.3+dfsg-3ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:Pro:22.04:LTS
- Versions
- 2:6.0.3.7+dfsg-2
- 2:6.1.4.1+dfsg-8ubuntu2
- 2:6.1.4.1+dfsg-8ubuntu2+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:24.04:LTS
- Versions
- 2:6.1.7.3+dfsg-2build1
- 2:6.1.7.3+dfsg-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:25.10
- Versions
- 2:6.1.7.3+dfsg-7
- 2:7.2.2.1+dfsg-7
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:26.10
- Versions
- 2:7.2.3+dfsg-2
- 2:7.2.3.2+dfsg-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
rails Ubuntu:26.04:LTS
- Versions
- 2:7.2.2.1+dfsg-7
- 2:7.2.2.2+dfsg-2
- 2:7.2.3+dfsg-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg
- https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5
- https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a
- https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b
- https://github.com/rails/rails/releases/tag/v7.2.3.1
- https://github.com/rails/rails/releases/tag/v8.0.4.1
- https://github.com/rails/rails/releases/tag/v8.1.2.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-33174