TI-2026-47397 Aliases CVE-2026-66749 GHSA-qjpw-62vp-8j4q

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

LOW 32CWE-476Published 2026-07-28 · Updated 2026-07-28

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00436 38th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
sdelements	lets-chat	0.4.0 – 0.4.8	—	No fix listed	CNA

lets-chat Vendorsdelements Affected 0.4.0 – 0.4.8 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-66749
2026-10-03 Alias added: GHSA-qjpw-62vp-8j4q

References

Exploit 1

Researcher Disclosure

TI-2026-47399 Let's Chat 0.3.0 - 0.4.8 Improper Authorization via DELETE /rooms/:room CVSS 4.0MEDIUM 5.3
TI-2026-47398 Let's Chat 0.3.0 - 0.4.8 Broken Access Control File Disclosure via GET /files route CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences