CVE-2026-33176

HIGH
2026-03-23 https://github.com/rails/rails
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 23, 2026 - 21:15 vuln.today
Patch Released
Mar 23, 2026 - 21:15 nvd
Patch available
CVE Published
Mar 23, 2026 - 21:15 nvd
HIGH 7.5

Tags

Denial Of Service

Description

### Impact Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which when converted to a string could be expanded 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. ### Releases The fixed releases are available at the normal locations.

Analysis

Rails ActiveSupport number helpers contain a denial of service vulnerability where strings with scientific notation (e.g., '1e10000') are improperly converted and expanded into extremely large decimal representations, causing excessive memory allocation and CPU consumption during string formatting. The vulnerability affects ActiveSupport across multiple Rails versions prior to 7.2.3.1, 8.0.4.1, and 8.1.2.1. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

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CVE-2026-33176 vulnerability details – vuln.today
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