Vulnerability Description
LightLLM through 1.2.0 contains an authentication bypass vulnerability in the /pd_register WebSocket endpoint that allows unauthenticated attackers to register arbitrary nodes by supplying crafted JSON without peer address validation. Attackers can disclose full user prompts routed to their socket, trigger denial of service by replacing legitimate nodes, or make the PD Master issue requests to internal network addresses.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/ModelTC/LightLLM
- https://github.com/ModelTC/LightLLM/issues/1576
- https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L198
- https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_pd.py#L
- https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_p
- https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_p
- https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authenticati
FAQ
What is CVE-2026-93839?
CVE-2026-93839 is a vulnerability with a CVSS score of 9.8 (CRITICAL). LightLLM through 1.2.0 contains an authentication bypass vulnerability in the /pd_register WebSocket endpoint that allows unauthenticated attackers to register arbitrary nodes by supplying crafted JSO...
How severe is CVE-2026-93839?
CVE-2026-93839 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-93839?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.