Unauthenticated Remote Code Execution Vulnerability in LightLLM by ModelTC
CVE-2026-26220

9.3CRITICAL

Key Information:

Vendor

Modeltc

Status
Lightllm
Vendor
CVE Published:
17 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-26220?

LightLLM, a product by ModelTC, has a vulnerability in versions 1.1.0 and earlier that allows unauthenticated remote code execution. In the PD (prefill-decode) disaggregation mode, the PD master node exposes WebSocket endpoints that accept binary frames and directly process them through the pickle.loads() function without any form of authentication or validation. This flaw enables attackers with network access to the PD master to send specially crafted payloads, potentially leading to arbitrary code execution on the server.

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Affected Version(s)

LightLLM 0 <= 1.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-26220 - Proof of Concept

References

https://chocapikk.com/posts/2026/lightllm-pickle-rce/
technical-descriptionexploit
https://github.com/ModelTC/LightLLM/issues/1213
issue-trackingpatch
https://lightllm-en.readthedocs.io/en/latest/index.html
product

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Valentin Lobstein (Chocapikk)
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