{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-62496", "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778", "state": "PUBLISHED", "assignerShortName": "Google", "dateReserved": "2025-10-15T08:47:41.878Z", "datePublished": "2025-10-16T15:52:05.654Z", "dateUpdated": "2025-10-16T17:26:25.654Z"}, "containers": {"cna": {"affected": [{"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"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Google Big Sleep"}], "datePublic": "2025-07-24T22:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "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. 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