Description
LightLLM through 1.2.0 contains a remote code execution vulnerability in the KV-transfer worker when started with --pd_trans_mode nccl, which exposes an unauthenticated RPyC control channel that deserializes attacker-supplied data. Attackers can send malicious pickled objects to the exposed RPyC ThreadedServer to execute arbitrary code with the privileges of the LightLLM service account.
References7
- github.com/ModelTC/LightLLM/issues/1590
- github.com/ModelTC/lightllm
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/…
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/…
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/…
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/…
- www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthentic…
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
9.3
CRITICAL
Score source: CNA
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/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 - EPSS — exploit probability
- 1% percentile: 68 · as of 9 November 2026
- CWE
- CWE-502
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.