ruby-advisory-db/gems/activesupport/CVE-2026-33170.yml at 03c7702be716a958a2e0b095e08c2ab0736cd55e · rubysec/ruby-advisory-db · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
---
gem: activesupport
framework: rails
cve: 2026-33170
ghsa: 89vf-4333-qx8v
url: https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v
title: Rails Active Support has a possible XSS vulnerability in SafeBuffer#%
date: 2026-03-23
description: |
  ### Impact
  `SafeBuffer#%` does not propagate the `@html_unsafe` flag to the newly created buffer.
  If a `SafeBuffer` is mutated in place (e.g. via `gsub!`) and then formatted with `%` using untrusted arguments,
  the result incorrectly reports `html_safe? == true`, bypassing ERB auto-escaping and possibly leading to XSS.

  ### Releases
  The fixed releases are available at the normal locations.
patched_versions:
  - "~> 7.2.3, >= 7.2.3.1"
  - "~> 8.0.4, >= 8.0.4.1"
  - ">= 8.1.2.1"
related:
  url:
    - https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v
    - https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7
    - https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db
    - https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb
    - 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://github.com/advisories/GHSA-89vf-4333-qx8v