Buffer overflow in Quickjs-ng Quickjs
CVE-2026-3979
A flaw has been found in quickjs-ng quickjs up to 0.12.1. This affects the function js_iterator_concat_return of the file quickjs.c. This manipulation causes use after free. The attack requires local access. The exploit has been published…
Vulnerability class: Buffer Overflow
EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Quickjs-ng Quickjs — versions 0.12.0, 0.12.1
Weakness classification (CWE)
References
- VDB-350414 | quickjs-ng quickjs quickjs.c js_iterator_concat_return use after free (technical-description, vdb-entry)
- VDB-350414 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #769600 | quickjs-ng QuickJS 0.12.1 Use-After-Free (third-party-advisory)
- cna@vuldb.com (issue-tracking)
- cna@vuldb.com (issue-tracking, patch)
- cna@vuldb.com (issue-tracking, exploit)
- cna@vuldb.com (patch)
- cna@vuldb.com (product)
Frequently asked questions
- What is CVE-2026-3979?
- CVE-2026-3979 is a medium-severity vulnerability in Quickjs-ng Quickjs, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-03-12.
- How severe is CVE-2026-3979?
- Medium severity. CVSS v3 base score is 5.3 out of 10.