| Name | CVE-2026-33170 |
| Description | Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `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. 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) |
| Debian Bugs | 1132035 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| rails (PTS) | bullseye | 2:6.0.3.7+dfsg-2+deb11u2 | vulnerable |
| bullseye (security) | 2:6.0.3.7+dfsg-2+deb11u4 | vulnerable | |
| bookworm, bookworm (security) | 2:6.1.7.10+dfsg-1~deb12u2 | vulnerable | |
| trixie (security), trixie | 2:7.2.2.2+dfsg-2~deb13u1 | vulnerable | |
| forky | 2:7.2.3+dfsg-3 | vulnerable | |
| sid | 2:7.2.3.1+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| rails | source | (unstable) | 2:7.2.3.1+dfsg-1 | 1132035 |
[trixie] - rails <no-dsa> (Minor issue)
[bookworm] - rails <no-dsa> (Minor issue)
https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v
Fixed by: https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7 (v8.1.2.1)
Fixed by: https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db (v8.0.4.1)
Fixed by: https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb (v7.2.3.1)