CVE-2026-0821

Name: CVE-2026-0821
Creator: NVD / NIST
Published: 2026-01-10T13:15:49.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2026-0821 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

5.5/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.44%

35.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Quickjs-Ng	Quickjs	<= 0.11.0

References

https://github.com/quickjs-ng/quickjs/
https://github.com/quickjs-ng/quickjs/commit/c5d80831e51e48a83eab16ea867be87f091783c5Patch
https://github.com/quickjs-ng/quickjs/issues/1296Exploit, Issue Tracking, Vendor Advisory
https://github.com/quickjs-ng/quickjs/issues/1296#issue-3780003395Exploit, Issue Tracking, Vendor Advisory
https://github.com/quickjs-ng/quickjs/pull/1299Issue Tracking
https://vuldb.com/?ctiid.340355Permissions Required, VDB Entry
https://vuldb.com/?id.340355Third Party Advisory, VDB Entry
https://vuldb.com/?submit.731780Third Party Advisory, VDB Entry

Timeline

Published: Jan 10, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-0821?

How severe is CVE-2026-0821?

CVE-2026-0821 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2026-0821?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-0821?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST