CVE-2026-33169
CVE-2026-33169 · Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
CVSS 6.9 · Medium · EPSS 0.7% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
activesupport
- 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:12
- Versions
- 2:6.1.7.10+dfsg-1~deb12u1
- 2:6.1.7.10+dfsg-1~deb12u2
- 2:6.1.7.3+dfsg-1
- 2:6.1.7.3+dfsg-10
- 2:6.1.7.3+dfsg-11
- 2:6.1.7.3+dfsg-12
- 2:6.1.7.3+dfsg-13
- 2:6.1.7.3+dfsg-2
- 2:6.1.7.3+dfsg-2~deb12u1
- 2:6.1.7.3+dfsg-3
- 2:6.1.7.3+dfsg-4
- 2:6.1.7.3+dfsg-5
- 2:6.1.7.3+dfsg-6
- 2:6.1.7.3+dfsg-7
- 2:6.1.7.3+dfsg-7~exp1
- 2:6.1.7.3+dfsg-8
- 2:6.1.7.3+dfsg-9
- Affected ranges
- ECOSYSTEM: < 2:6.1.7.10+dfsg-1~deb12u3
Update to 2:6.1.7.10+dfsg-1~deb12u3
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-cg4j-q9v8-6v38
- https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11
- https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
- https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49
- 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-2026-33169