CVE-2026-33169

MEDIUM

Active Support <8.1.2.1/8.0.4.1/7.2.3.1 - DoS

Title source: llm
STIX 2.1

Description

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

References (7)

Core 7

Scores

CVSS v3 5.3
EPSS 0.0050
EPSS Percentile 38.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-1333 CWE-400
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