CVE-2025-62496

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Since <code>n_bits</code> is too small, the calculated <code>n_limbs</code> is also <b>significantly underestimated</b>.</p></li><li><p>The function proceeds to allocate a <b><code>JSBigInt</code></b> object using this underestimated <code>n_limbs</code>.</p></li><li><p>When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a <b>Heap Out-of-Bounds Write</b> as data is written past the end of the allocated <code>r-&gt;tab</code> array.</p></li></ol><br>"}], "value": "A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number of digits.\n\nThe function calculates the necessary number of bits (n_bits) required to store the BigInt using the formula:\n\n$$\\text{n\\_bits} = (\\text{n\\_digits} \\times 27 + 7) / 8 \\quad (\\text{for radix 10})$$\n\n * For large input strings (e.g., $79,536,432$ digits or more for base 10), the intermediate calculation $(\\text{n\\_digits} \\times 27 + 7)$ exceeds the maximum value of a standard signed 32-bit integer, resulting in an Integer Overflow.\n\n\n * The resulting n_bits value becomes unexpectedly small or even negative due to this wrap-around.\n\n\n * This flawed n_bits is then used to compute n_limbs, the number of memory \"limbs\" needed for the BigInt object. Since n_bits is too small, the calculated n_limbs is also significantly underestimated.\n\n\n * The function proceeds to allocate a JSBigInt object using this underestimated n_limbs.\n\n\n * When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a Heap Out-of-Bounds Write as data is written past the end of the allocated r->tab array."}], "impacts": [{"capecId": "CAPEC-175", "descriptions": [{"lang": "en", "value": "CAPEC-175 Code Inclusion"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "baseScore": 7.1, "baseSeverity": "HIGH", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "PASSIVE", "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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "14ed7db2-1595-443d-9d34-6215bf890778", "shortName": "Google", "dateUpdated": "2025-10-16T15:52:05.654Z"}, "references": [{"url": "https://bellard.org/quickjs/Changelog"}, {"url": "https://issuetracker.google.com/434193016"}], "source": {"discovery": "UNKNOWN"}, "title": "Integer overflow in js_bigint_from_string in QuickJS", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-10-16T17:26:14.998141Z", "id": "CVE-2025-62496", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-16T17:26:25.654Z"}}]}}

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Since n_bits is too small, the calculated n_limbs is also significantly underestimated.\n\n\n * The function proceeds to allocate a JSBigInt object using this underestimated n_limbs.\n\n\n * When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a Heap Out-of-Bounds Write as data is written past the end of the allocated r->tab array.", "supportingMedia": [{"type": "text/html", "value": "<p>A vulnerability exists in the QuickJS engine's BigInt string parsing logic (<code>js_bigint_from_string</code>) when attempting to create a BigInt from a string with an <b>excessively large number of digits</b>.</p><p>The function calculates the necessary number of bits (<code>n_bits</code>) required to store the BigInt using the formula:</p><div>$$\\text{n\\_bits} = (\\text{n\\_digits} \\times 27 + 7) / 8 \\quad (\\text{for radix 10})$$</div><ol><li><p>For large input strings (e.g., $79,536,432$ digits or more for base 10), the intermediate calculation $(\\text{n\\_digits} \\times 27 + 7)$ exceeds the maximum value of a standard signed 32-bit integer, resulting in an <b>Integer Overflow</b>.</p></li><li><p>The resulting <code>n_bits</code> value becomes unexpectedly small or even <b>negative</b> due to this wrap-around.</p></li><li><p>This flawed <code>n_bits</code> is then used to compute <code>n_limbs</code>, the number of memory \"limbs\" needed for the BigInt object. Since <code>n_bits</code> is too small, the calculated <code>n_limbs</code> is also <b>significantly underestimated</b>.</p></li><li><p>The function proceeds to allocate a <b><code>JSBigInt</code></b> object using this underestimated <code>n_limbs</code>.</p></li><li><p>When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a <b>Heap Out-of-Bounds Write</b> as data is written past the end of the allocated <code>r-&gt;tab</code> array.</p></li></ol><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "providerMetadata": {"orgId": "14ed7db2-1595-443d-9d34-6215bf890778", "shortName": "Google", "dateUpdated": "2025-10-16T15:52:05.654Z"}}}, "cveMetadata": {"cveId": "CVE-2025-62496", "state": "PUBLISHED", "dateUpdated": "2025-10-16T17:26:25.654Z", "dateReserved": "2025-10-15T08:47:41.878Z", "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778", "datePublished": "2025-10-16T15:52:05.654Z", "assignerShortName": "Google"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"collectionURL": "https://bellard.org/quickjs/", "defaultStatus": "unaffected", "packageName": "js_bigint_from_string", "product": "QuickJS", "vendor": "QuickJS", "versions": [{"lessThan": "2025-09-13", "status": "affected", "version": "2025-04-26", "versionType": "date"}]}], "source": "cve-coordination@google.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:quickjs_project:quickjs:*:*:*:*:*:*:*:*", "matchCriteriaId": "AB84E2DC-74EA-4956-9521-C2B652B8E8C2", "versionEndExcluding": "2025-09-13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number of digits.\n\nThe function calculates the necessary number of bits (n_bits) required to store the BigInt using the formula:\n\n$$\\text{n\\_bits} = (\\text{n\\_digits} \\times 27 + 7) / 8 \\quad (\\text{for radix 10})$$\n\n * For large input strings (e.g., $79,536,432$ digits or more for base 10), the intermediate calculation $(\\text{n\\_digits} \\times 27 + 7)$ exceeds the maximum value of a standard signed 32-bit integer, resulting in an Integer Overflow.\n\n\n * The resulting n_bits value becomes unexpectedly small or even negative due to this wrap-around.\n\n\n * This flawed n_bits is then used to compute n_limbs, the number of memory \"limbs\" needed for the BigInt object. Since n_bits is too small, the calculated n_limbs is also significantly underestimated.\n\n\n * The function proceeds to allocate a JSBigInt object using this underestimated n_limbs.\n\n\n * When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a Heap Out-of-Bounds Write as data is written past the end of the allocated r->tab array."}, {"lang": "es", "value": "Una vulnerabilidad existe en la l\u00f3gica de an\u00e1lisis de cadenas BigInt del motor QuickJS (js_bigint_from_string) al intentar crear un BigInt a partir de una cadena con un n\u00famero excesivamente grande de d\u00edgitos.\n\nLa funci\u00f3n calcula el n\u00famero necesario de bits (n_bits) requerido para almacenar el BigInt utilizando la f\u00f3rmula:\n\n$$\\text{n\\_bits} = (\\text{n\\_digits} \\times 27 + 7) / 8 \\quad (\\text{para base 10})$$\n\n * Para cadenas de entrada grandes (por ejemplo, $79,536,432$ d\u00edgitos o m\u00e1s para base 10), el c\u00e1lculo intermedio $(\\text{n\\_digits} \\times 27 + 7)$ excede el valor m\u00e1ximo de un entero con signo est\u00e1ndar de 32 bits, lo que resulta en un desbordamiento de entero.\n\n\n * El valor resultante de n_bits se vuelve inesperadamente peque\u00f1o o incluso negativo debido a este ajuste c\u00edclico.\n\n\n * Este n_bits defectuoso se utiliza entonces para calcular n_limbs, el n\u00famero de 'limbs' de memoria necesarios para el objeto BigInt. Dado que n_bits es demasiado peque\u00f1o, el n_limbs calculado tambi\u00e9n se subestima significativamente.\n\n\n * La funci\u00f3n procede a asignar un objeto JSBigInt utilizando este n_limbs subestimado.\n\n\n * Cuando la funci\u00f3n intenta posteriormente escribir los datos reales del BigInt en el objeto asignado, el peque\u00f1o tama\u00f1o del b\u00fafer se excede r\u00e1pidamente, lo que lleva a una escritura fuera de l\u00edmites en el heap a medida que los datos se escriben m\u00e1s all\u00e1 del final del array r -> tab asignado."}], "id": "CVE-2025-62496", "lastModified": "2026-10-19T17:10:00.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "PASSIVE", "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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cve-coordination@google.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-62496", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-16T17:26:14.998141Z", "version": "2.0.3"}}]}, "published": "2025-10-16T16:15:40.260", "references": [{"source": "cve-coordination@google.com", "tags": ["Release Notes"], "url": "https://bellard.org/quickjs/Changelog"}, {"source": "cve-coordination@google.com", "tags": ["Exploit", "Issue Tracking"], "url": "https://issuetracker.google.com/434193016"}], "sourceIdentifier": "cve-coordination@google.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "cve-coordination@google.com", "type": "Secondary"}]}

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{"created": "2025-10-21T09:40:00.711133+00:00", "updated": "2025-10-21T09:40:00.711160+00:00", "vendors": ["quickjs-ng", "quickjs-ng$PRODUCT$quickjs"]}