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.
References (6)
Core 6
Core References
Various Sources technical-description
exploit
https://chocapikk.com/posts/2026/lightllm-pickle-rce/
Issue Tracking issue-tracking
https://github.com/ModelTC/LightLLM/issues/1213
Various Sources product
https://lightllm-en.readthedocs.io/en/latest/index.html
Various Sources product
https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310
Various Sources product
https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce
Scores
CVSS v4
9.3
EPSS
0.0066
EPSS Percentile
48.0%
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
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-502
Status
published
Products (1)
ModelTC/LightLLM
< 1.1.0
Published
Feb 17, 2026
Tracked Since
Feb 18, 2026