CVE-2026-26220criticalCWE-502

CVE-2026-26220: critical vulnerability in ModelTC LightLLM

LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.3epss 1.0%
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
ModelTC · LightLLM
Related CVEs — ModelTC LightLLM

In the same product, most dangerous first.

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