CVE-2026-33169

MEDIUM EPSS 38.9%
Published Mar 24, 20263mo ago · Modified Jun 17, 20262w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Mar 24, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
38.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-1333
CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 3

VendorProductVersionRange
rubyonrailsrails* <7.2.3.1
rubyonrailsrails*≥8.0.0  –  <8.0.4.1
rubyonrailsrails*≥8.1.0  –  <8.1.2.1

References 7

  • github.com https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11
    Patch
  • github.com https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
    Patch
  • github.com https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49
    Patch
  • github.com https://github.com/rails/rails/releases/tag/v7.2.3.1
    Release Notes
  • github.com https://github.com/rails/rails/releases/tag/v8.0.4.1
    Release Notes
  • github.com https://github.com/rails/rails/releases/tag/v8.1.2.1
    Release Notes
  • github.com https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
    Vendor Advisory

Remediation

  • github.com https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11
    Patch
  • github.com https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
    Patch
  • github.com https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49
    Patch