CVE-2026-26220 CRITICAL

CVE-2026-26220: LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE

Vendor Modeltc
Product LightLLM
Weakness CWE-502 · Unsafe deserialization
Published February 17, 2026
Last update February 17, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 17, 2026 CVE published
February 17, 2026 Record updated