---
title: "CVE-2026-105192: LMCache: Remote code execution via unsafe deserialization in multiprocess mode transport"
url: https://erroneo.us/security/cve/CVE-2026-105192/
description: "CVE-2026-105192 (lmcache (PyPI)): LMCache multiprocess mode, also called distributed mode, opens an unauthenticated ZeroMQ ROUTER so worker processes can…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-10-07
date_modified: 2026-10-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-105192"
kev: false
cvss: 9.8
epss: 0.00482
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-105192: LMCache: Remote code execution via unsafe deserialization in multiprocess mode transport

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes lmcache (PyPI) >= 0.3.9, < 0.5.6, fixed in 0.5.6 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- PyPI `lmcache` >= 0.3.9, < 0.5.6 → fixed: 0.5.6

## Affected products (CVE record)

- LMCache LMCache: 0.3.9 <= *

## Severity

- JFROG CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.48% probability of exploitation activity in the next 30 days; percentile 41.

## Sources

- [GitHub Advisory GHSA-w5f2-9q9c-ff4h](https://github.com/advisories/GHSA-w5f2-9q9c-ff4h)
- [CVE.org record CVE-2026-105192](https://www.cve.org/CVERecord?id=CVE-2026-105192)
- [NVD entry CVE-2026-105192](https://nvd.nist.gov/vuln/detail/CVE-2026-105192)
- [LMCache repository](https://github.com/LMCache/LMCache)
- [lmcache on PyPI](https://pypi.org/project/lmcache/)
- [DeviceIPCWrapper.Deserialize calls pickle.loads (v0.5.5)](https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/platform/base/ipc_wrapper.py)
- [msgpack extension code 1 decoded with pickle (v0.3.9)](https://github.com/LMCache/LMCache/blob/v0.3.9/lmcache/v1/multiprocess/custom_types.py)
- [github.com](https://github.com/LMCache/LMCache/security/advisories/GHSA-w5f2-9q9c-ff4h)
- [github.com](https://github.com/LMCache/LMCache/pull/5644)
- [github.com](https://github.com/LMCache/LMCache/pull/5684)
- [github.com](https://github.com/LMCache/LMCache/pull/5685)
- [github.com](https://github.com/LMCache/LMCache/commit/160b6dec469edb765efd1fad42aca5a438b08bb5)
- [github.com](https://github.com/LMCache/LMCache/commit/62f74c417dfe1ba56761733fd25dc8209a192f20)
- [github.com](https://github.com/LMCache/LMCache/commit/767c7e367bbdc357c445cf7bd2ed259cff8d5865)
- [blog.lmcache.ai](https://blog.lmcache.ai/en/2026/10/13/an-update-on-cve-2026-105192)
- [research.jfrog.com](https://research.jfrog.com/vulnerabilities/lmcache-is-vulnerable-to-unauthenticated-remote-code-execution-via-pickle-deserialization-on-the-multiprocess-zmq-transport-cve-2026-105192-jfsa-2026-001694382)

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Source page: https://erroneo.us/security/cve/CVE-2026-105192/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt