CVE-2026-26220

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.

CVSS v4.0

9.3 CRITICALCVSS: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

0.66% chance of exploitation in the next 30 days, 49th percentile

Published

2026-02-17

Updated

2026-07-14

Proof-of-concept exploits (1)

• https://chocapikk.com/posts/2026/lightllm-pickle-rce/

References

• CVE Record
• NVD entry

Related

• CVE-2026-2622
• CVE-2026-26221
• CVE-2026-26217
• CVE-2026-26224
• CVE-2026-26216
• CVE-2026-26225