CVE-2026-33169

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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:rubyonrails:rails::::::::
	cpe:2.3:a:rubyonrails:rails::::::::
	cpe:2.3:a:rubyonrails:rails::::::::

History

No history.

Information

Published : 2026-03-24 00:16

Updated : 2026-03-24 18:01

NVD link : CVE-2026-33169

Mitre link : CVE-2026-33169

CVE.ORG link : CVE-2026-33169

JSON object : View

Products Affected

rubyonrails

rails

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-1333

Inefficient Regular Expression Complexity

{"id": "CVE-2026-33169", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-24T00:16:28.113", "references": [{"url": "https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/releases/tag/v7.2.3.1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/releases/tag/v8.0.4.1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/releases/tag/v8.1.2.1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-1333"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Active Support es un conjunto de herramientas de bibliotecas de soporte y extensiones del n\u00facleo de Ruby extra\u00eddas del framework Rails. 'NumberToDelimitedConverter' utiliza una expresi\u00f3n regular basada en lookahead con 'gsub!' para insertar delimitadores de millares. Antes de las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1, la interacci\u00f3n entre el grupo lookahead repetido y 'gsub!' puede producir una complejidad de tiempo cuadr\u00e1tica en cadenas de d\u00edgitos largas. Las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1 contienen un parche."}], "lastModified": "2026-03-24T18:01:08.873", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D9DC6CB9-DC6C-4CBB-9806-3936ADBC8F1B", "versionEndExcluding": "7.2.3.1"}, {"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA8791E1-8B96-43F6-A3EC-A7E60D700330", "versionEndExcluding": "8.0.4.1", "versionStartIncluding": "8.0.0"}, {"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "978E0135-D14B-41DE-87E4-CF059A23E189", "versionEndExcluding": "8.1.2.1", "versionStartIncluding": "8.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}