CVE-2025-62494

{"id": "CVE-2025-62494", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-62494", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2025-10-16T17:46:18.542287Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "cve-coordination@google.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.1, "Automatable": "NOT_DEFINED", "attackVector": "ADJACENT", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cve-coordination@google.com", "affectedData": [{"vendor": "QuickJS", "product": "QuickJS", "versions": [{"status": "affected", "version": "2025-04-26", "lessThan": "2025-09-13", "versionType": "date"}], "packageName": "JS_ConcatStringInPlace", "collectionURL": "https://bellard.org/quickjs/", "defaultStatus": "unaffected"}]}], "published": "2025-10-16T16:15:39.943", "references": [{"url": "https://bellard.org/quickjs/Changelog", "tags": ["Release Notes"], "source": "cve-coordination@google.com"}, {"url": "https://issuetracker.google.com/434193023", "tags": ["Exploit", "Issue Tracking"], "source": "cve-coordination@google.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cve-coordination@google.com", "description": [{"lang": "en", "value": "CWE-704"}]}], "descriptions": [{"lang": "en", "value": "A type confusion vulnerability exists in the handling of the string addition (+) operation within the QuickJS engine.\n\n * The code first checks if the left-hand operand is a string.\n\n\n * It then attempts to convert the right-hand operand to a primitive value using JS_ToPrimitiveFree. This conversion can trigger a callback (e.g., toString or valueOf).\n\n\n * During this callback, an attacker can modify the type of the left-hand operand in memory, changing it from a string to a different type (e.g., an object or an array).\n\n\n * The code then proceeds to call JS_ConcatStringInPlace, which still treats the modified left-hand value as a string.\n\n\nThis mismatch between the assumed type (string) and the actual type allows an attacker to control the data structure being processed by the concatenation logic, resulting in a type confusion condition. This can lead to out-of-bounds memory access, potentially resulting in memory corruption and arbitrary code execution in the context of the QuickJS runtime."}, {"lang": "es", "value": "Existe una vulnerabilidad de confusi\u00f3n de tipos en el manejo de la operaci\u00f3n de adici\u00f3n de cadenas (+) dentro del motor QuickJS.\n\n * El c\u00f3digo primero verifica si el operando de la izquierda es una cadena.\n\n * Luego intenta convertir el operando de la derecha a un valor primitivo usando JS_ToPrimitiveFree. Esta conversi\u00f3n puede activar una devoluci\u00f3n de llamada (por ejemplo, toString o valueOf).\n\n * Durante esta devoluci\u00f3n de llamada, un atacante puede modificar el tipo del operando de la izquierda en memoria, cambi\u00e1ndolo de una cadena a un tipo diferente (por ejemplo, un objeto o un array).\n\n * El c\u00f3digo luego procede a llamar a JS_ConcatStringInPlace, que a\u00fan trata el valor de la izquierda modificado como una cadena.\n\nEste desajuste entre el tipo asumido (cadena) y el tipo real permite a un atacante controlar la estructura de datos que est\u00e1 siendo procesada por la l\u00f3gica de concatenaci\u00f3n, lo que resulta en una condici\u00f3n de confusi\u00f3n de tipos. Esto puede llevar a un acceso a memoria fuera de l\u00edmites, lo que podr\u00eda resultar en corrupci\u00f3n de memoria y ejecuci\u00f3n de c\u00f3digo arbitrario en el contexto del entorno de ejecuci\u00f3n de QuickJS."}], "lastModified": "2026-10-19T16:10:00.260", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:quickjs_project:quickjs:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AB84E2DC-74EA-4956-9521-C2B652B8E8C2", "versionEndExcluding": "2025-09-13"}], "operator": "OR"}]}], "sourceIdentifier": "cve-coordination@google.com"}