Critical severity · published Oct 7, 2026
CVE-2026-107204
LMCache through 0.5.5 Unauthenticated RCE via /run_script Endpoint
9.8
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LM
LMCache · LMCache
through 0.5.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107204
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107204
issue-tracking
https://github.com/LMCache/LMCache/issues/5510
product
https://github.com/LMCache/LMCache
technical-description
https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/internal_api_server/common/run_script_api.py#L54-L76
technical-description
https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/multiprocess/http_apis/common_api.py#L41-L46
third-party-advisory
https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-via-run-script-endpoint
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