Out-of-bounds Read in Quickjs
CVE-2025-62493
A vulnerability exists in the QuickJS engine's BigInt string conversion logic (js_bigint_to_string1) due to an incorrect calculation of the required number of digits, which in turn leads to reading memory past the allocated BigInt structur…
Vulnerability class: Buffer Overflow
EPSS: 0.003 (26.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
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-2025-62493?
- CVE-2025-62493 is a medium-severity vulnerability in Quickjs, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2025-10-16.
- How severe is CVE-2025-62493?
- Medium severity. CVSS v3 base score is 6.5 out of 10.