CVE-2026-33176

HIGH

ActiveSupport < 8.1.2.1, < 8.0.4.1, < 7.2.3.1 - Denial of Service via BigDecimal Scientific Notation Expansion

Title source: llm
STIX 2.1

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.

References (7)

Core 7

Scores

CVSS v3 7.5
EPSS 0.0061
EPSS Percentile 44.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400 CWE-770
Status published
Products (7)
rails/activesupport < 7.2.3.1
rails/activesupport >= 8.0.0.beta1, < 8.0.4.1
rails/activesupport >= 8.1.0.beta1, < 8.1.2.1
rubygems/activesupport 0 - 7.2.3.1RubyGems
rubygems/activesupport 8.0.0.beta1 - 8.0.4.1RubyGems
rubygems/activesupport 8.1.0.beta1 - 8.1.2.1RubyGems
rubyonrails/rails < 7.2.3.1
Published Mar 24, 2026
Tracked Since Mar 24, 2026