CVE-2026-33176Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rubyonrails rails rubyonrails:rails | before 7.2.3.1; from 8.0.0 before 8.0.4.1; from 8.1.0 before 8.1.2.1 | NVD |
References
- https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcbpatch
- https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1apatch
- https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856patch
- https://github.com/rails/rails/releases/tag/v7.2.3.1release-notes
- https://github.com/rails/rails/releases/tag/v8.0.4.1release-notes
- https://github.com/rails/rails/releases/tag/v8.1.2.1release-notes
- https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.