CVE-2026-66749
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductSdelements Lets-chat
PublishedJul 28, 2026
First seenJul 28, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| sdelements lets-chat | 0.4.0 ≤ v ≤ 0.4.8, 84981a6d2534445c00ea4e095c934e46943c0b1d ≤ v ≤ 617207ff3c0c0bf8e3c7a915bd9ec03f1dd8390c | — |
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