PT-2026-27260 · Rails · Active Storage

Published 2026-03-23 · Updated 2026-03-24 · CVE-2026-33174

NVD

CVSS v4.0

6.6

Medium

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-33174

Affected Products

Active Storage

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-33174 · Security Note
• https://github.com/rails/rails/releases/tag/v8.0.4.1 · Note
• https://github.com/rails/rails/releases/tag/v8.1.2.1 · Note
• https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg · Note
• https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5 · Note
• https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b · Note
• https://github.com/rails/rails/releases/tag/v7.2.3.1 · Note
• https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a · Note