Heap-Based Buffer Overflow in quickjs by quickjs-ng
CVE-2026-0821

6.9MEDIUM

Key Information:

Vendor

Quickjs-ng

Status
Quickjs
Vendor
CVE Published:
10 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-0821?

A vulnerability has been identified in quickjs-ng's quickjs up to version 0.11.0, specifically within the js_typed_array_constructor function in quickjs.c. This flaw allows for heap-based buffer overflow, which can be exploited remotely through crafted input. Such manipulation can lead to unexpected behavior or potential disruption of service. It is essential to apply the recommended patch (commit c5d80831e51e48a83eab16ea867be87f091783c5) to remediate this issue promptly and enhance the security of the affected product.

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Deploy the Patch

Affected Version(s)

quickjs 0.1

quickjs 0.2

quickjs 0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-0821 - Proof of Concept

References

https://vuldb.com/?id.340355
vdb-entrytechnical-description
https://vuldb.com/?ctiid.340355
signaturepermissions-required
https://vuldb.com/?submit.731780
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

mcsky23 (VulDB User)
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