CVE-2026-26220

published 2026-02-17

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…

Priority P2 72 critical 9.3 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

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
modeltc	lightllm	<= 1.1.0	—

Detection & IOCs extracted from sources · hover to see the quote

other pickle.loads() called on unauthenticated WebSocket binary frames↗

• → Monitor for unauthenticated WebSocket connections to LightLLM PD master node endpoints receiving binary frames — these may carry malicious pickle payloads for RCE. ↗
• → Detect LightLLM running in PD (prefill-decode) disaggregation mode as an attack surface; any external network access to the PD master node should be treated as high-risk. ↗

• · No fix is available as of the publication date (Feb 17, 2026); LightLLM 1.1.0 and all prior versions are affected with no patch released. ↗
• · The vulnerability is only exploitable when LightLLM is deployed in PD disaggregation mode; standard deployments not using this mode may not expose the vulnerable WebSocket endpoints. ↗

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