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Vulnerability · Published Jan 10, 2026 · Assigned by VulDB

CVE-2026-0821quickjs-ng quickjs quickjs.c js_typed_array_constructor heap-based overflow

High 7.3

In plain English

A high-severity heap buffer overflow in quickjs from quickjs-ng. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.5%top 55.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23quickjs-ng0.11.0-r1ALPINE-CVE-2026-0821
Alpine:v3.24quickjs-ng0.11.0-r2ALPINE-CVE-2026-0821
Debian:13quickjsno fix listedDEBIAN-CVE-2026-0821
Debian:14quickjsno fix listedDEBIAN-CVE-2026-0821
Ubuntu:25.10quickjsno fix listedUBUNTU-CVE-2026-0821
Ubuntu:26.04:LTSquickjsno fix listedUBUNTU-CVE-2026-0821

Affected products (as reported)

VendorProductVersions
quickjs-ng quickjs 0.10.20.30.40.50.60.70.8

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

References