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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/LMCache/LMCache
disclosure@vulncheck.com
https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/internal_api_server/c…
disclosure@vulncheck.com
https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/multiprocess/http_api…
disclosure@vulncheck.com
https://github.com/LMCache/LMCache/issues/5510
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-…
disclosure@vulncheck.com