CVE-2026-33176
Rails Active Support has a possible DoS vulnerability in its number helpers
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Timeline
ID reserved
By GitHub_M
- 6 days later
· 6 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Medium6.6 | 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 |
| NVDNVD · Analyzed | 4.0 | Medium6.6 | 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.86% · top 41% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.6.
Weakness
Affected products
- affected >= 8.1.0.beta1, < 8.1.2.1
- affected >= 8.0.0.beta1, < 8.0.4.1
- affected < 7.2.3.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- RubyGemsactivesupportGHSA-2j26-frm8-cmj9 (opens in a new tab)
References (7)
- https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856 (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v7.2.3.1 (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v8.0.4.1 (opens in a new tab)x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v8.1.2.1 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-2j26-frm8-cmj9 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-33176)Record last updated .