CVE-2026-107204: Lmcache

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Lmcache Lmcache: up to and including 0.5.5

Published 2026-10-07. Last modified 2026-10-08.