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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 9.3NVD modified 2026-10-08 21:07
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 6
- 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
- https://github.com/LMCache/LMCache/issues/5510