CVE-2025-62491

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-62491", "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778", "state": "PUBLISHED", "assignerShortName": "Google", "dateReserved": "2025-10-15T08:47:41.878Z", "datePublished": "2025-10-16T15:51:24.238Z", "dateUpdated": "2025-10-16T18:04:16.529Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://bellard.org/quickjs/", "defaultStatus": "unaffected", "packageName": "js_std_promise_rejection_check", "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 <b>Use-After-Free (UAF)</b> vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (<code>ts-&gt;rejected_promise_list</code>).</p><ol><li><p>The function <b><code>js_std_promise_rejection_check</code></b> attempts to iterate over the <code>rejected_promise_list</code> to report unhandled rejections using a standard list loop.</p></li><li><p>The <b>reason</b> for a promise rejection is processed inside the loop, including calling <code>js_std_dump_error1(ctx, rp-&gt;reason)</code>.</p></li><li><p>If the promise <b>rejection reason</b> is an <b>Error object</b> that defines a custom property <b>getter</b> (e.g., via <code>Object.defineProperty</code>), this getter is executed during the error dumping process.</p></li><li><p>The malicious custom getter can execute JavaScript code that calls <b><code>catch()</code></b> on the <i>same</i> rejected promise being processed.</p></li><li><p>Calling <code>catch()</code> internally triggers <b><code>js_std_promise_rejection_tracker</code></b>, which then <b>removes and frees</b> the current promise entry (<code>JSRejectedPromiseEntry</code>) from the <code>rejected_promise_list</code>.</p></li><li><p>Since the list iteration continues using the now-freed memory pointer (<code>el</code>), the subsequent loop access results in a <b>Use-After-Free</b> condition.</p></li></ol><br>"}], "value": "A Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (ts->rejected_promise_list).\n\n * The function js_std_promise_rejection_check attempts to iterate over the rejected_promise_list to report unhandled rejections using a standard list loop.\n\n\n * The reason for a promise rejection is processed inside the loop, including calling js_std_dump_error1(ctx, rp->reason).\n\n\n * If the promise rejection reason is an Error object that defines a custom property getter (e.g., via Object.defineProperty), this getter is executed during the error dumping process.\n\n\n * The malicious custom getter can execute JavaScript code that calls catch() on the same rejected promise being processed.\n\n\n * Calling catch() internally triggers js_std_promise_rejection_tracker, which then removes and frees the current promise entry (JSRejectedPromiseEntry) from the rejected_promise_list.\n\n\n * Since the list iteration continues using the now-freed memory pointer (el), the subsequent loop access results in a Use-After-Free condition."}], "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": 8.8, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "PASSIVE", 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{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-62491", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-10-16T18:03:58.190903Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-16T18:04:10.405Z"}}], "cna": {"title": "Use-after-free in js_std_promise_rejection_check in QuickJS", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "Google Big Sleep"}], "impacts": [{"capecId": "CAPEC-175", "descriptions": [{"lang": "en", "value": "CAPEC-175 Code Inclusion"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.8, "Automatable": "NOT_DEFINED", "attackVector": "ADJACENT", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "QuickJS", "product": "QuickJS", "versions": [{"status": "affected", "version": "2025-04-26", "lessThan": "2025-09-13", "versionType": "date"}], "packageName": "js_std_promise_rejection_check", "collectionURL": "https://bellard.org/quickjs/", "defaultStatus": "unaffected"}], "datePublic": "2025-07-24T22:00:00.000Z", "references": [{"url": "https://bellard.org/quickjs/Changelog"}, {"url": "https://issuetracker.google.com/434195203"}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "A Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (ts->rejected_promise_list).\n\n * The function js_std_promise_rejection_check attempts to iterate over the rejected_promise_list to report unhandled rejections using a standard list loop.\n\n\n * The reason for a promise rejection is processed inside the loop, including calling js_std_dump_error1(ctx, rp->reason).\n\n\n * If the promise rejection reason is an Error object that defines a custom property getter (e.g., via Object.defineProperty), this getter is executed during the error dumping process.\n\n\n * The malicious custom getter can execute JavaScript code that calls catch() on the same rejected promise being processed.\n\n\n * Calling catch() internally triggers js_std_promise_rejection_tracker, which then removes and frees the current promise entry (JSRejectedPromiseEntry) from the rejected_promise_list.\n\n\n * Since the list iteration continues using the now-freed memory pointer (el), the subsequent loop access results in a Use-After-Free condition.", "supportingMedia": [{"type": "text/html", "value": "<p>A <b>Use-After-Free (UAF)</b> vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (<code>ts-&gt;rejected_promise_list</code>).</p><ol><li><p>The function <b><code>js_std_promise_rejection_check</code></b> attempts to iterate over the <code>rejected_promise_list</code> to report unhandled rejections using a standard list loop.</p></li><li><p>The <b>reason</b> for a promise rejection is processed inside the loop, including calling <code>js_std_dump_error1(ctx, rp-&gt;reason)</code>.</p></li><li><p>If the promise <b>rejection reason</b> is an <b>Error object</b> that defines a custom property <b>getter</b> (e.g., via <code>Object.defineProperty</code>), this getter is executed during the error dumping process.</p></li><li><p>The malicious custom getter can execute JavaScript code that calls <b><code>catch()</code></b> on the <i>same</i> rejected promise being processed.</p></li><li><p>Calling <code>catch()</code> internally triggers <b><code>js_std_promise_rejection_tracker</code></b>, which then <b>removes and frees</b> the current promise entry (<code>JSRejectedPromiseEntry</code>) from the <code>rejected_promise_list</code>.</p></li><li><p>Since the list iteration continues using the now-freed memory pointer (<code>el</code>), the subsequent loop access results in a <b>Use-After-Free</b> condition.</p></li></ol><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "14ed7db2-1595-443d-9d34-6215bf890778", "shortName": "Google", 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{"affected": [{"affectedData": [{"collectionURL": "https://bellard.org/quickjs/", "defaultStatus": "unaffected", "packageName": "js_std_promise_rejection_check", "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 Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (ts->rejected_promise_list).\n\n * The function js_std_promise_rejection_check attempts to iterate over the rejected_promise_list to report unhandled rejections using a standard list loop.\n\n\n * The reason for a promise rejection is processed inside the loop, including calling js_std_dump_error1(ctx, rp->reason).\n\n\n * If the promise rejection reason is an Error object that defines a custom property getter (e.g., via Object.defineProperty), this getter is executed during the error dumping process.\n\n\n * The malicious custom getter can execute JavaScript code that calls catch() on the same rejected promise being processed.\n\n\n * Calling catch() internally triggers js_std_promise_rejection_tracker, which then removes and frees the current promise entry (JSRejectedPromiseEntry) from the rejected_promise_list.\n\n\n * Since the list iteration continues using the now-freed memory pointer (el), the subsequent loop access results in a Use-After-Free condition."}, {"lang": "es", "value": "Una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n (UAF) existe en la biblioteca est\u00e1ndar del motor QuickJS al iterar sobre la lista global de promesas rechazadas no manejadas (ts -> rejected_promise_list).\n\n * La funci\u00f3n js_std_promise_rejection_check intenta iterar sobre la rejected_promise_list para informar rechazos no manejados utilizando un bucle de lista est\u00e1ndar.\n\n * La raz\u00f3n de un rechazo de promesa se procesa dentro del bucle, incluyendo la llamada a js_std_dump_error1(ctx, rp -> reason).\n\n * Si la raz\u00f3n del rechazo de la promesa es un objeto Error que define un getter de propiedad personalizado (por ejemplo, a trav\u00e9s de Object.defineProperty), este getter se ejecuta durante el proceso de volcado de errores.\n\n * El getter personalizado malicioso puede ejecutar c\u00f3digo JavaScript que llama a catch() en la misma promesa rechazada que se est\u00e1 procesando.\n\n * La llamada a catch() internamente activa js_std_promise_rejection_tracker, que luego elimina y libera la entrada de promesa actual (JSRejectedPromiseEntry) de la rejected_promise_list.\n\n * Dado que la iteraci\u00f3n de la lista contin\u00faa utilizando el puntero de memoria ahora liberado (el), el acceso posterior del bucle resulta en una condici\u00f3n de uso despu\u00e9s de liberaci\u00f3n."}], "id": "CVE-2025-62491", "lastModified": "2026-10-19T16:10:00.260", "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": 8.8, "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": "NONE", "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:N/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-2025-62491", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-16T18:03:58.190903Z", "version": "2.0.3"}}]}, "published": "2025-10-16T16:15:39.470", "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/434195203"}], "sourceIdentifier": "cve-coordination@google.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "cve-coordination@google.com", "type": "Secondary"}]}

{}

{"created": "2025-10-21T09:40:04.233514+00:00", "updated": "2025-10-21T09:40:04.233541+00:00", "vendors": ["quickjs-ng", "quickjs-ng$PRODUCT$quickjs"]}