GHSA-2j26-frm8-cmj9
Rails Active Support has a possible DoS vulnerability in its number helpers
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | activesupport | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
| RubyGems | activesupport | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
| RubyGems | activesupport | < 7.2.3.1 | 7.2.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which when converted to a string could be expanded into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability.
### Releases
The fixed releases are available at the normal locations.
### Credit
This issue was responsibly reported by Hackerone researcher [manun](https://hackerone.com/manun).
References
External links from the advisory. They lead to third-party sites.
- https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9
- https://nvd.nist.gov/vuln/detail/CVE-2026-33176
- https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb
- https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a
- https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856
- https://github.com/rails/rails
- 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/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33176.yml