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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00016.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
rails activesupport affected
Version Status Constraints
>= 8.1.0.beta1, < 8.1.2.1 affected —
>= 8.0.0.beta1, < 8.0.4.1 affected —
< 7.2.3.1 affected —

Configuration 1 [-]

OR cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*

No data.

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Vendors Products
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Activesupport Subscribe

Project Subscriptions

Vendors Products
Rails Subscribe
Activesupport Subscribe
Rubyonrails Subscribe
Rails Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-2j26-frm8-cmj9 Rails Active Support has a possible DoS vulnerability in its number helpers
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb cve-icon cve-icon cve-icon
https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a cve-icon cve-icon cve-icon
https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856 cve-icon cve-icon cve-icon
https://github.com/rails/rails/releases/tag/v7.2.3.1 cve-icon cve-icon cve-icon
https://github.com/rails/rails/releases/tag/v8.0.4.1 cve-icon cve-icon cve-icon
https://github.com/rails/rails/releases/tag/v8.1.2.1 cve-icon cve-icon cve-icon
https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-33176 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-33176 cve-icon
History

Tue, 24 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 24 Mar 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Rubyonrails
Rubyonrails rails
CPEs cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
Vendors & Products Rubyonrails
Rubyonrails rails
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Tue, 24 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Tue, 24 Mar 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Rails
Rails activesupport
Vendors & Products Rails
Rails activesupport

Tue, 24 Mar 2026 02:30:00 +0000

Type Values Removed Values Added
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.
Title Rails Active Support has a possible DoS vulnerability in its number helpers
Weaknesses CWE-400
CWE-770
References
Metrics cvssV4_0

{'score': 6.6, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-24T18:42:48.858Z

Reserved: 2026-03-17T22:16:36.719Z

Link: CVE-2026-33176

cve-icon Vulnrichment

Updated: 2026-03-24T18:42:45.999Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-24T00:16:28.807

Modified: 2026-03-24T17:55:27.437

Link: CVE-2026-33176

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-23T23:29:27Z

Links: CVE-2026-33176 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-24T10:29:53Z

Weaknesses