CVE-2026-107204 PUBLISHED

LMCache through 0.5.5 Unauthenticated RCE via /run_script Endpoint

Assigner: VulnCheck
Reserved: 07.10.2026 Published: 07.10.2026 Updated: 07.10.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	LMCache
Product	LMCache
Versions	Default: unaffected affected from 0 to 0.5.5 (incl.)

CVE-2026-107204 PUBLISHED

LMCache through 0.5.5 Unauthenticated RCE via /run_script Endpoint

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Product Status

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Problem Types