---
id: CVE-2026-107204
title: >-
  LMCache through 0.5.5 contains an unauthenticated remote code execution
  vulnerability that allows remote attackers to execute Python code by posting
  scripts to the /run_script endpoint
summary: >-
  LMCache through 0.5.5 contains an unauthenticated remote code execution
  vulnerability that allows remote attackers to execute Python code by posting
  scripts to the /run_script endpoint. Attackers can recover real builtins
  through the inj…
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
vendor: LMCache
product: LMCache
affected:
  - LMCache <= 0.5.5
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T17:16:53.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107204'
references:
  - url: 'https://github.com/LMCache/LMCache'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/internal_api_server/common/run_script_api.py#L54-L76
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/multiprocess/http_apis/common_api.py#L41-L46
    label: disclosure@vulncheck.com
  - url: 'https://github.com/LMCache/LMCache/issues/5510'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-via-run-script-endpoint
    label: disclosure@vulncheck.com
  - url: 'https://github.com/LMCache/LMCache/issues/5510'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-07T17:08:57.542279Z'
ingestedAt: '2026-10-07T16:38:22.224Z'
---

## Overview

LMCache through 0.5.5 contains an unauthenticated remote code execution vulnerability that allows remote attackers to execute Python code by posting scripts to the /run_script endpoint. Attackers can recover real builtins through the injected FastAPI app object, bypassing the guarded __import__, to import os and run operating system commands as the LMCache process.

## Remediation

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