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CVE-2026-107204— LMCache through 0.5.5 Unauthenticated RCE via /run_script Endpoint

Quick assessment

Affected
LMCache LMCache
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LMCache 0.5.5 及之前版本存在一个未经验证的远程代码执行漏洞。攻击者可通过向 端点提交脚本，执行任意 Python 代码。通过注入到 FastAPI 应用对象中，攻击者能够绕过受保护的 机制，直接访问真实的内置模块（builtins），从而导入 模块并作为 LMCache 进程的用户执行操作系统命令。

CVSS 9.8 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
LMCache LMCache ≤ 0.5.5 affected
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I. Basic Information for CVE-2026-107204

Vulnerability Information
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Vulnerability Title
LMCache through 0.5.5 Unauthenticated RCE via /run_script Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LMCache LMCache 0 ~ 0.5.5 -

II. Public POCs for CVE-2026-107204

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III. Intelligence Information for CVE-2026-107204

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Patches & Fixes for CVE-2026-107204 (3)

News Coverage for CVE-2026-107204 (1)

Same Patch Batch · LMCache · 2026-10-07 · 5 CVEs total

CVE-2026-105192 9.8 CRITICAL LMCache Unauthenticated RCE in multiprocess mode via pickle deserialization
CVE-2026-107206 9.4 CRITICAL LMCache through 0.5.5 Missing Authentication in MP HTTP Server Management API
CVE-2026-107205 8.6 HIGH LMCache through 0.5.5 Missing Authentication in MP Coordinator Fleet Control API
CVE-2026-107207 7.2 HIGH LMCache through 0.5.5 Missing Authentication in Frontend Node Catalog Allows SSRF Allowlis

IV. Related Vulnerabilities

Same product: LMCache
Same vendor: LMCache
Same weakness: CWE-306

V. Comments for CVE-2026-107204

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