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CVE-2026-33169— Rails Active Support has a possible ReDoS vulnerability in number_to_delimited

Quick assessment

Affected
rails activesupport
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在安全漏洞，该漏洞源于正则表达式存在二次时间复杂度问题，可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-33169

Vulnerability Information
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Vulnerability Title
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Rails 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在安全漏洞，该漏洞源于正则表达式存在二次时间复杂度问题，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rails activesupport >= 8.1.0.beta1, < 8.1.2.1 -

II. Public POCs for CVE-2026-33169

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III. Intelligence Information for CVE-2026-33169

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Patches & Fixes for CVE-2026-33169 (4)

Vendor Advisories for CVE-2026-33169 (1)

Vendor Pages for CVE-2026-33169 (2)

Same Patch Batch · rails · 2026-03-23 · 9 CVEs total

CVE-2026-33195 8.0 HIGH Rails Active Storage has possible Path Traversal in DiskService
CVE-2026-33167 Rails has a possible XSS vulnerability in its Action Pack debug exceptions
CVE-2026-33168 Rails has a possible XSS vulnerability in its Action View tag helpers
CVE-2026-33170 Rails Active Support has a possible XSS vulnerability in SafeBuffer#%
CVE-2026-33176 Rails Active Support has a possible DoS vulnerability in its number helpers
CVE-2026-33173 Rails Active Storage has possible content type bypass via metadata in direct uploads
CVE-2026-33174 Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range request
CVE-2026-33202 Rails Active Storage has possible glob injection in its DiskService

IV. Related Vulnerabilities

Same product: activesupport
Same vendor: rails
Same weakness: CWE-400

V. Comments for CVE-2026-33169

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