{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-122131", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-04T18:13:10.837Z", "datePublished": "2026-11-04T20:36:51.069Z", "dateUpdated": "2026-11-04T20:36:51.069Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-04T20:36:51.069Z"}, "datePublic": "2026-10-28T00:00:00.000Z", "title": "Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 Prototype Replacement via __proto__ Language Key", "descriptions": [{"lang": "en", "value": "Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 contains a prototype pollution vulnerability in lib/messages.js compile() and merge() that fails to reject a __proto__ language key. Attackers supplying untrusted message configuration via any().messages(), prefs, validate options or Joi.extend can replace the compiled messages prototype, altering or breaking validation error rendering and dependent logic."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "cweId": "CWE-1321", "type": "CWE"}]}], "affected": [{"vendor": "hapijs", "product": "joi", "defaultStatus": "unaffected", "packageURL": "pkg:npm/joi", "versions": [{"version": "17.13.6", "status": "affected", "lessThan": "17.13.9", "versionType": "semver"}, {"version": "18.2.5", "status": "affected", "lessThan": "18.3.1", "versionType": "semver"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW"}}], "references": [{"url": "https://github.com/hapijs/joi/commit/76f5771e1afe527cfda24be0e1a920ffa54888d6", "tags": ["patch"], "name": "Patch Commit"}, {"url": "https://github.com/hapijs/joi", "tags": ["product"]}, {"url": "https://github.com/hapijs/joi/commit/dae9467cec27e787bfdea8b276595177d52d28ec", "tags": ["patch"]}, {"url": "https://github.com/hapijs/joi/pull/3164", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/hapijs/joi/security/advisories/GHSA-6w3j-5fw6-r9vr", "tags": ["related", "vendor-advisory"], "name": "GitHub Security Advisory (GHSA-6w3j-5fw6-r9vr)"}, {"url": "https://github.com/hapijs/joi/blob/v18.3.0/lib/messages.js#L64-L67", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 Prototype Replacement via __proto__ Language Key", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/joi-17.13.6-before-17.13.9-and-18.2.5-before-18.3.1-prototype-replacement-via-proto-language-key"}], "credits": [{"lang": "en", "value": "Zachariah Mithani (AploSec)", "type": "finder"}, {"lang": "en", "value": "Marsup", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:npm/joi", "product": "joi", "vendor": "hapijs", "versions": [{"lessThan": "17.13.9", "status": "affected", "version": "17.13.6", "versionType": "semver"}, {"lessThan": "18.3.1", "status": "affected", "version": "18.2.5", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 contains a prototype pollution vulnerability in lib/messages.js compile() and merge() that fails to reject a __proto__ language key. Attackers supplying untrusted message configuration via any().messages(), prefs, validate options or Joi.extend can replace the compiled messages prototype, altering or breaking validation error rendering and dependent logic."}], "id": "CVE-2026-122131", "lastModified": "2026-11-04T21:18:08.710", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-11-04T21:18:08.710", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/hapijs/joi"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/hapijs/joi/blob/v18.3.0/lib/messages.js#L64-L67"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/hapijs/joi/commit/76f5771e1afe527cfda24be0e1a920ffa54888d6"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/hapijs/joi/commit/dae9467cec27e787bfdea8b276595177d52d28ec"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/hapijs/joi/pull/3164"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/hapijs/joi/security/advisories/GHSA-6w3j-5fw6-r9vr"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/joi-17.13.6-before-17.13.9-and-18.2.5-before-18.3.1-prototype-replacement-via-proto-language-key"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1321"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[17.13.6,17.13.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[18.2.5,18.3.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "joi", "source": "cna", "vendor": "hapijs"}, "product": "joi", "vendor": "hapijs"}], "created": "2026-11-04T21:45:14.732888+00:00", "updated": "2026-11-04T22:00:18.075345+00:00", "vendors": ["hapijs", "hapijs$PRODUCT$joi"]}