CVE-2026-33176

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{"affected": [{"affectedData": [{"product": "activesupport", "vendor": "rails", "versions": [{"status": "affected", "version": ">= 8.1.0.beta1, < 8.1.2.1"}, {"status": "affected", "version": ">= 8.0.0.beta1, < 8.0.4.1"}, {"status": "affected", "version": "< 7.2.3.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "matchCriteriaId": "D9DC6CB9-DC6C-4CBB-9806-3936ADBC8F1B", "versionEndExcluding": "7.2.3.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "matchCriteriaId": "FA8791E1-8B96-43F6-A3EC-A7E60D700330", "versionEndExcluding": "8.0.4.1", "versionStartIncluding": "8.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "matchCriteriaId": "978E0135-D14B-41DE-87E4-CF059A23E189", "versionEndExcluding": "8.1.2.1", "versionStartIncluding": "8.1.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. 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 de Rails. Antes de las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1, los ayudantes de n\u00fameros de Active Support aceptan cadenas que contienen notaci\u00f3n cient\u00edfica (p. ej. '1e10000'), que `BigDecimal` expande en representaciones decimales extremadamente grandes. Esto puede causar una asignaci\u00f3n excesiva de memoria y consumo de CPU cuando el n\u00famero expandido es formateado, posiblemente resultando en una vulnerabilidad de DoS. Las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1 contienen un parche."}], "id": "CVE-2026-33176", "lastModified": "2026-06-17T10:37:05.023", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.6, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33176", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-24T18:42:42.653404Z", "version": "2.0.3"}}]}, "published": "2026-03-24T00:16:28.807", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/rails/rails/releases/tag/v7.2.3.1"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/rails/rails/releases/tag/v8.0.4.1"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/rails/rails/releases/tag/v8.1.2.1"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "Rails: Active Support: Active Support: Denial of Service via large scientific notation strings", "id": "2450551", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450551"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in Active Support, a toolkit of support libraries for Ruby on Rails. A remote attacker can exploit this vulnerability by providing specially crafted strings containing scientific notation (e.g., \"1e10000\") to number helpers. This input causes the `BigDecimal` component to expand into extremely large decimal representations, consuming excessive memory and CPU resources. This can lead to a Denial of Service (DoS) vulnerability, making the affected system unavailable."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, applications that use Active Support number helpers to process untrusted input should implement strict input validation. This involves sanitizing or restricting the format and length of numerical strings before they are passed to Active Support, thereby preventing the `BigDecimal` component from expanding into extremely large decimal representations and consuming excessive resources."}, "name": "CVE-2026-33176", "package_state": [{"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "rubygem-activesupport", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite:el8/rubygem-activesupport", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-03-23T23:29:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33176\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33176\nhttps://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb\nhttps://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a\nhttps://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856\nhttps://github.com/rails/rails/releases/tag/v7.2.3.1\nhttps://github.com/rails/rails/releases/tag/v8.0.4.1\nhttps://github.com/rails/rails/releases/tag/v8.1.2.1\nhttps://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9"], "threat_severity": "Moderate"}

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