---
id: CVE-2026-90919
title: >-
  LightLLM through 1.2.0 contains a remote code execution vulnerability in the
  Config Server's unauthenticated /visual_register WebSocket endpoint that
  passes the first client frame directly to pickle.loads()
summary: >-
  LightLLM through 1.2.0 contains a remote code execution vulnerability in the
  Config Server's unauthenticated /visual_register WebSocket endpoint that
  passes the first client frame directly to pickle.loads(). Attackers can reach
  the Confi…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
vendor: ModelTC
product: LightLLM
affected:
  - LightLLM <= 1.2.0
published: '2026-09-14'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:44.447'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90919'
references:
  - url: >-
      https://github.com/ModelTC/LightLLM/blob/v1.2.0/lightllm/server/config_server/api_http.py#L79-L86
    label: disclosure@vulncheck.com
  - url: 'https://github.com/ModelTC/LightLLM/issues/1563'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/ModelTC/lightllm'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code-execution-via-config-server-pickle-deserialization
    label: disclosure@vulncheck.com
  - url: 'https://github.com/ModelTC/LightLLM/issues/1563'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.01086
epssPercentile: 0.63858
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-14T14:24:06.459437Z'
ingestedAt: '2026-09-14T15:23:07.421Z'
---

## Overview

LightLLM through 1.2.0 contains a remote code execution vulnerability in the Config Server's unauthenticated /visual_register WebSocket endpoint that passes the first client frame directly to pickle.loads(). Attackers can reach the Config Server port and send a malicious serialized payload with a __reduce__ method to execute arbitrary code with Config Server process privileges.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.