CVE-2026-107204

CRITICAL 9.8

LMCache through 0.5.5 Unauthenticated RCE via /run_script Endpoint

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-306
Vendor	lmcache
Product	lmcache
Published	Oct 7, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

LMCache / LMCache

0 ≤ 0.5.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Mingkai Yu Jiajia Liu