Buffer overflow in Quickjs-Ng Quickjs
CVE-2026-0821
A vulnerability was determined in quickjs-ng quickjs up to 0.11.0. This vulnerability affects the function js_typed_array_constructor of the file quickjs.c. Executing a manipulation can lead to heap-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. This patch is called c5d80831e51e48a83eab16ea867be87f091783c5. A patch should be applied to remediate this issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Quickjs-Ng Quickjs — versions 0.1, 0.2, 0.3
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/quickjs-ng/quickjs/issues/1296 (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- github.com/quickjs-ng/quickjs/pull/1299 (issue-tracking, Issue Tracking)
- github.com/quickjs-ng/quickjs/issues/1296 (issue-tracking, Exploit, exploit, Issue Tracking, Vendor Advisory)
- github.com/quickjs-ng/quickjs/commit/c5d80831e51e48a83eab16ea867be87f091783c5 (Patch, patch)
- github.com/quickjs-ng/quickjs/ (product)
Frequently asked questions
- What is CVE-2026-0821?
- CVE-2026-0821 is a high-severity vulnerability in Quickjs-Ng Quickjs, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-01-10.
- How severe is CVE-2026-0821?
- High severity. CVSS v3 base score is 7.3 out of 10.