---
id: CVE-2026-105192
title: >-
  LMCache multiprocess mode, also called distributed mode, opens an
  unauthenticated ZeroMQ ROUTER so worker processes can register and share KV
  cache blocks
summary: >-
  LMCache multiprocess mode, also called distributed mode, opens an
  unauthenticated ZeroMQ ROUTER so worker processes can register and share KV
  cache blocks. Messages on that socket are msgpack. Extension code 1 is passed
  to DeviceIPCWrapp…
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-306
  - CWE-502
vendor: LMCache
product: lmcache
affected:
  - lmcache >= 0.3.9 <= *
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T10:17:32.647'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105192'
references:
  - url: 'https://github.com/LMCache/LMCache'
    label: reefs@jfrog.com
  - url: >-
      https://github.com/LMCache/LMCache/blob/v0.3.9/lmcache/v1/multiprocess/custom_types.py
    label: reefs@jfrog.com
  - url: >-
      https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/platform/base/ipc_wrapper.py
    label: reefs@jfrog.com
  - url: 'https://pypi.org/project/lmcache/'
    label: reefs@jfrog.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-07T10:25:12.185Z'
---

## Overview

LMCache multiprocess mode, also called distributed mode, opens an unauthenticated ZeroMQ ROUTER so worker processes can register and share KV cache blocks. Messages on that socket are msgpack. Extension code 1 is passed to DeviceIPCWrapper.Deserialize, which calls pickle.loads, while the server is still decoding request arguments and before the handler runs. A single unauthenticated ZMQ DEALER message to the transport port (default 5555) therefore executes code as the user the LMCache process runs as. Official container images run that process as root. The transport binds to localhost unless the operator sets a routable address with --host, which is how multi-node deployments let peers connect.

## Remediation

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