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Node.js CVE-2026-66749

| EUVDEUVD-2026-49874 HIGH
NULL Pointer Dereference (CWE-476)
2026-07-28 disclosure@vulncheck.com GHSA-qjpw-62vp-8j4q
Denial Of Service Null Pointer Dereference Node.js
7.1
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 28, 2026 - 16:34 vuln.today
CVE Published
Jul 28, 2026 - 16:20 cve.org
HIGH 7.1

DescriptionCVE.org

Let's Chat 0.4.0 through 0.4.8 contains a null dereference vulnerability that allows authenticated attackers to crash the server by supplying a valid 24-character hex string room parameter that matches no document in the database. Attackers can send a crafted GET /messages request causing an uncaught TypeError in an asynchronous Mongoose callback that terminates the Node.js server process, with the same defect reachable through multiple code paths including the socket.io interface.

Articles & Coverage 2

News 3 New Node.js Vulnerabilities - 0 Critical, 3 High Jul 29, 2026 News 3 New Node.js Vulnerabilities - 0 Critical, 3 High Jul 28, 2026

AnalysisAI

Denial of service via null dereference in Let's Chat 0.4.0 through 0.4.8 allows authenticated users to crash the server by sending a crafted request with a non-existent room ID. The vulnerability is remotely exploitable with no user interaction, and publicly available proof-of-concept code exists. …

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CVE-2026-66749 vulnerability details – vuln.today
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