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

EPSS 0.02% · P6
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
railsactivesupport >= 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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Same Patch Batch · rails · 2026-03-23 · 9 CVEs total

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