CVE-2026-26220CWE-502

LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE

Critical · published February 17, 2026

CVSS v4.0
9.3
EPSS
2%
Percentile
79.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
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
EPSS
0.01861 · 79.1th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-02-17T01:52Z
EPSS history
Timeline
  • 17 FEB 01:52Z
    LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE
    cvelistv5