Critical severity9.8NVD Advisory· Published Sep 18, 2026
CVE-2026-93839
CVE-2026-93839
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.
Patches
Vulnerability mechanics
References
6- github.com/ModelTC/LightLLM/issues/1576nvd
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.pynvd
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_pd.pynvd
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.pynvd
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.pynvd
- www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-in-pd-master-pd-register-websocket-endpointnvd
News mentions
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