CVE-2026-120440Suited to automated attack · CISA

QuickJS-NG before 0.16.0 Memory Leak via Atomics.store

CVSS score

6.9

EPSS probability

—

Risk score

0.7

Published

3 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

Checking session…

Vulnerability description

DayBreach AI Explanation

Verified against sources

QuickJS-NG Atomics.store Memory Leak Vulnerability

Sources read

Source agreement

0/2

Evidence confidence

%44

Short explanation

A memory leak vulnerability in QuickJS-NG before version 0.16.0 allows attackers running JavaScript to exhaust heap memory and cause a denial of service condition.

Why does it matter?

The vulnerability enables attackers to trigger a denial of service condition and can lead to heap memory exhaustion.

What should be done?

Follow vendor advisory guidance
Apply available patches or updates

Note on uncertainty

2 alanda kaynak uyuşmazlığı var. DayBreach bu değerleri saklamadı; kaynak karşılaştırması aşağıda gösteriliyor.

Chain of evidence and sources2 verified claims

QuickJS-NG 0.16.0 öncesi sürümlerde Atomics.store üzerinden bir bellek sızıntısı açığı bulunur.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Saldırganlar JavaScript çalıştırarak yığın belleğini tüketebilir ve hizmet dışı bırakma durumuna neden olabilir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

QuickJS-NG before 0.16.0 contains a memory leak vulnerability in js_atomics_store() in quickjs.c that fails to free the converted value when returning a RangeError. Attackers running JavaScript can repeatedly call Atomics.store with a valueOf that detaches or shrinks the buffer to exhaust heap memory and cause denial of service.

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CWE: CWE-401

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-120440 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	quickjs-ng	QuickJS-NG	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.9	CVSS V40	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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	NVD
6.9	CVSS V4_0	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	CVE CNA
5.3	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	NVD
5.3	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

cvelist

CNA çözüm referansı

Open source

reference

Yama veya çözüm referansı

Open source

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-120440 is associated with the following CWEs:

CWE-401: Common Weakness Enumeration Entry CWE-401

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-120440 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

GitHub Security Advisory (GHSA-wm7w-r6qf-3c9w)vendor-advisory https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7epatch QuickJS-NG v0.16.0 Release Notesvendor-advisory https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154vendor-advisory VulnCheck Advisory: QuickJS-NG before 0.16.0 Memory Leak via Atomics.storevendor-advisory

CVSS Vector Radar Chart

6.9 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)Low

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

quickjs-ng

Weakness Type (CWE & CAPEC)

CWE-401

Similar Vulnerabilities

8.5

CVE-2026-120438QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration

Vendorquickjs-ng ProductQuickJS-NG

Patch verified3 h ago

8.3

CVE-2026-120439QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort