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CVE-2026-66749

HighPublished

Let's Chat 0.4.0 - 0.4.8 Denial of Service via Null Dereference in Room Lookup

Published: Jul 28, 2026
Updated: Jul 28, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 5, 2026

Primary CVSS

7.1/ 10High

nvd · CVSS 4.0

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

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 24.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-66749-Unchecked-Room-Lookup-Leads-to-Server-Crash-Let-s-Chat-Research
Security Advisory: Unchecked Room Lookup Leads to Server Crash (Let's Chat)

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