Rails Active Support has a possible DoS vulnerability in its number helpers

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0086, the 58th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:16 UTC First seen by agentprime
2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-2j26-frm8-cmj9
• OSV: GHSA-2j26-frm8-cmj9
• github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9
• nvd.nist.gov/vuln/detail/CVE-2026-33176
• github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb
• github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a
• github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856
• github.com/rails/rails
• github.com/rails/rails/releases/tag/v7.2.3.1
• github.com/rails/rails/releases/tag/v8.0.4.1
• github.com/rails/rails/releases/tag/v8.1.2.1
• github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33176.yml

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.