CVE-2026-107204

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.

References

• https://github.com/LMCache/LMCache
• https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/internal_api_server/common/run_script_api.py#L54-L76
• https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/multiprocess/http_apis/common_api.py#L41-L46
• https://github.com/LMCache/LMCache/issues/5510
• https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-via-run-script-endpoint