Description
LightLLM version 1.1.0 and prior contain an unauthenticated remote code execution vulnerability in PD (prefill-decode) disaggregation mode. The PD master node exposes WebSocket endpoints that receive binary frames and pass the data directly to pickle.loads() without authentication or validation. A remote attacker who can reach the PD master can send a crafted payload to achieve arbitrary code execution.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ModelTC | LightLLM | ≤ 1.1.0 | — |
References
- https://chocapikk.com/posts/2026/lightllm-pickle-rce/ technical-description exploit
- https://github.com/ModelTC/LightLLM/issues/1213 issue-tracking
- https://lightllm-en.readthedocs.io/en/latest/index.html product
- https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310 product
- https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331 product
- https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce third-party-advisory