Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/theopaid/Unchecked-Room-Lookup-Leads-to-Server-Crash-Let-s-Ch
- https://www.vulncheck.com/advisories/let-s-chat-denial-of-service-via-null-deref
FAQ
What is CVE-2026-66749?
CVE-2026-66749 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 matche...
How severe is CVE-2026-66749?
CVE-2026-66749 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66749?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.