PT-2026-65519 · Sdelements · Lets-Chat

Theodosis Paidakis · CVE-2026-66749 · Published 2026-07-28 · Updated 2026-07-28

Mitre

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-66749

Affected Products

Lets-Chat

References · 3

• 🔥 https://github.com/theopaid/Unchecked-Room-Lookup-Leads-to-Server-Crash-Let-s-Chat- · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-66749 · Security Note
• https://vulncheck.com/advisories/let-s-chat-denial-of-service-via-null-dereference-in-room-lookup · Note