| Name | CVE-2026-33174 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6546-1 |
| Debian Bugs | 1132035 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| rails (PTS) | bookworm | 2:6.1.7.10+dfsg-1~deb12u2 | fixed |
| bookworm (security) | 2:6.1.7.10+dfsg-1~deb12u3 | fixed | |
| trixie | 2:7.2.2.2+dfsg-2~deb13u1 | vulnerable | |
| trixie (security) | 2:7.2.2.2+dfsg-2~deb13u2 | fixed | |
| forky | 2:7.2.4+dfsg-1 | fixed | |
| sid | 2:7.2.4+dfsg-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| rails | source | bookworm | (not affected) | |||
| rails | source | trixie | 2:7.2.2.2+dfsg-2~deb13u2 | DSA-6546-1 | ||
| rails | source | (unstable) | 2:7.2.3.1+dfsg-1 | 1132035 |
[bookworm] - rails <not-affected> (Vulnerable code introduced later; ActiveStorage::Streaming proxy Range handling added in 7.0)
[bullseye] - rails <postponed> (Minor issue, DoS)
https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg
Fixed by: https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a (v8.1.2.1)
Fixed by: https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5 (v8.0.4.1)
Fixed by: https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b (v7.2.3.1)