CVE-2026-93839CWE-306

CVE-2026-93839

Critical · published September 19, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
54.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00761 · 54.8th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-09-19T00:17Z
References (8)
https://github.com/ModelTC/LightLLM · [email protected]https://github.com/ModelTC/LightLLM/issues/1576 · [email protected]https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L198-L205 · [email protected]https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_pd.py#L26-L36 · [email protected]https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.py#L691-L698 · [email protected]https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.py#L714-L749 · [email protected]https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-in-pd-master-pd-register-websocket-endpoint · [email protected]https://github.com/ModelTC/LightLLM/issues/1576 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 1%
    epss
  • 18 SEP 19:06Z
    LightLLM through 1.2.0 Missing Authentication in PD Master /pd_register WebSocket Endpoint
    cvelistv5