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CVE-2026-33169

Rails Active Support has a possible ReDoS vulnerability in number_to_delimited

Published: Mar 23, 2026Updated: Mar 24, 2026 Sources: CVE List NVD BDUCWE-400
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.5%
Top 61.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-400CWE-1333

Affected Products

РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Red Hat SatelliteRed Hat Inc.
On-prem
Operating Systems
Ruby on RailsRails Core Team
Library
OSS Libraries / web-framework
activesupportrails
Library
OSS Libraries / web-framework
railsrubyonrailsOSS Libraries
ооо «ред софт»commercialRUOperating Systemsaka red soft
red hat inc.commercialUSOperating Systemsaka red hat
rails core teamoss-projectOSS Librariesaka rubyonrails, rails, actionview, rack? no
railsoss-projectOSS Librariesaka rails-html-sanitizer, activestorage
rubyonrailsoss-projectUSOSS Librariesaka rails, ruby on rails, rubyonrails.org

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/rails/rails/releases/tag/v7.2.3.1
github.com
https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
github.com
https://github.com/rails/rails/releases/tag/v8.0.4.1
github.com
and 14 more references View all →

Timeline

Published
Mar 23, 2026
Last Updated
Mar 24, 2026

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