Use After Free Vulnerability in quickjs-ng by QuickJS
CVE-2026-1144

5.3MEDIUM

Key Information:

Vendor

Quickjs-ng

Status
Quickjs
Vendor
CVE Published:
19 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-1144?

A vulnerability has been identified in quickjs-ng, specifically affecting the Atomics Ops Handler in the quickjs.c file. This vulnerability allows for a use after free condition, which could be exploited remotely. The issue results from improper memory management, leading to potential unauthorized access and manipulation of data. To address this vulnerability, it is crucial to apply the provided patch (commit ea3e9d77454e8fc9cb3ef3c504e9c16af5a80141) promptly.

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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-2026-1144 - Proof of Concept

References

https://vuldb.com/?id.341737
vdb-entry
https://vuldb.com/?ctiid.341737
signaturepermissions-required
https://vuldb.com/?submit.735537
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

mcsky23 (VulDB User)
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