EUVD-2026-94383
GHSA-xgvf-x9rh-chj9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated HTTP POST to /run_script gives direct code execution as the process, so AV:N/AC:L/PR:N/UI:N with full C/I/A; scope unchanged as impact stays within the LMCache process context.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Unauthenticated remote code execution in LMCache through 0.5.5 allows network-reachable attackers to execute arbitrary Python and operating-system commands as the LMCache process by posting scripts to the /run_script endpoint; the endpoint's existing __import__ guard is bypassed via the injected FastAPI app object, which exposes real builtins (CWE-306, CVSS 9.3 v4.0 / 3.1 AV:N/AC:L/PR:N/UI:N). No public exploit code or confirmed in-the-wild activity has been identified at time of analysis, though the vulnerability details and vendor advisory are public. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to LMCache's internal API HTTP server that exposes the /run_script endpoint (implemented in lmcache/v1/internal_api_server/common/run_script_api.py and routed via multiprocess/http_apis/common_api.py) in versions up to and including 0.5.5. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not an inflated-CVSS artifact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch has been identified in the provided references at time of analysis; the GitHub issue https://github.com/LMCache/LMCache/issues/5510 and the VulnCheck advisory https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-via-run-script-endpoint are the tracking resources. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every LMCache deployment at or below version 0.5.5 and determine whether its internal API HTTP server is enabled and bound to anything other than 127.0.0.1; where it is network-reachable, immediately restrict it to localhost or a trusted management VLAN via host firewall or bind address, and where the /run_script endpoint is not operationally required, disable or block it at the reverse proxy or ingress layer. …
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External POC / Exploit Code
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