CVE-2026-93839
published 2026-09-18CVE-2026-93839: LightLLM through 1.2.0 contains an authentication bypass vulnerability in the /pd_register WebSocket endpoint that allows unauthenticated attackers to register…
PriorityP269critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.76%
53.7th percentile
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| modeltc | lightllm | <= 1.2.0 | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.09.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
ModelTC LightLLM up to 1.2.0 WebSocket Endpoint /pd_register improper authentication
vuldb·2026-09-18·CVSS 9.8
CVE-2026-93839 [CRITICAL] ModelTC LightLLM up to 1.2.0 WebSocket Endpoint /pd_register improper authentication
A vulnerability, which was classified as critical, has been found in ModelTC LightLLM up to 1.2.0. Affected by this issue is some unknown functionality of the file /pd_register of the component WebSocket Endpoint. Performing a manipulation results in improper authentication.
This vulnerability was named CVE-2026-93839. The attack may be initiated remotely. There is no available exploit.
GHSA
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
ghsa_unreviewed·2026-09-18
CVE-2026-93839 [CRITICAL] CWE-306 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
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/ModelTC/LightLLMhttps://github.com/ModelTC/LightLLM/issues/1576https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L198-L205https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_pd.py#L26-L36https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.py#L691-L698https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.py#L714-L749https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-in-pd-master-pd-register-websocket-endpointhttps://github.com/ModelTC/LightLLM/issues/1576
2026-09-18
Published