{"cve":"CVE-2025-62491","nvd":{"published":"2025-10-16T16:15:39.470","modified":"2026-10-19T16:10:00.260","status":"Analyzed","description":"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.","cvss_v4":{"vector":"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","score":8.8},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-416"],"references":["https://bellard.org/quickjs/Changelog","https://issuetracker.google.com/434195203"],"products":["quickjs_project:quickjs"],"source":"nvd","synced_at":"2026-10-19T22:12:35.277909958+00:00"},"epss":{"cve":"CVE-2025-62491","score":0.00407,"percentile":0.34719,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}