Use After Free in Quickjs
CVE-2025-62491
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). * The function js_std_promise_rejection_check attempts…
Vulnerability class: Use-After-Free
EPSS: 0.004 (29.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Quickjs — versions 2025-04-26
- Quickjs_project Quickjs
Weakness classification (CWE)
References
- cve-coordination@google.com (Release Notes)
- cve-coordination@google.com (Exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2025-62491?
- CVE-2025-62491 is a high-severity vulnerability in Quickjs, classified under Use After Free. CVSS score: 8.8/10. Published 2025-10-16.
- How severe is CVE-2025-62491?
- High severity. CVSS v3 base score is 8.8 out of 10.