GitHub Advisoryadvisory · RubyGems
GHSA-2j26-frm8-cmj9 Rails Active Support has a possible DoS vulnerability in its number helpers
MEDIUM
Official page ↗
- Aliases
- CVE-2026-33176
- Ecosystem
- RubyGems
- Packages
- activesupport
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
- Weaknesses
- CWE-400, CWE-770
- Reviewed
- 2026-03-23
Affected packages
• RubyGems activesupport: >= 8.1.0.beta1, < 8.1.2.1 → fixed in 8.1.2.1
• RubyGems activesupport: >= 8.0.0.beta1, < 8.0.4.1 → fixed in 8.0.4.1
• RubyGems activesupport: < 7.2.3.1 → fixed in 7.2.3.1
Description
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.
Related
Alias · CVE (1)
- CVE-2026-33176 Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. vulnerability
References
- https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-33176 advisory
- https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb web
- https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a web
- https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856 web
- https://github.com/rails/rails package
- https://github.com/rails/rails/releases/tag/v7.2.3.1 web
- https://github.com/rails/rails/releases/tag/v8.0.4.1 web
- https://github.com/rails/rails/releases/tag/v8.1.2.1 web
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33176.yml web