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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
5.3MEDIUM
NVD MITRE
EPSS Score
0.5%
Top 59.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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

rails
oss-projectaka rails-html-sanitizer, activestorage
activesupportLibrary
OSS Libraries / web-framework
rubyonrails
oss-project·USaka rails, rubyonrails.org, ruby on rails
rails
OSS Libraries
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
Red Hat Inc.
commercial·USaka red hat
Red Hat SatelliteOn-prem
Operating Systems / linux-distro
Rails Core Team
oss-projectaka actionview, rubyonrails, rails, rack? no
Ruby on RailsLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
github.com
https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11
github.com
https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
github.com
and 14 more references View all →

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