---
title: "CVE-2026-107204: LMCache - Remote Code Execution"
description: "LMCache <= 0.5.5 contains a remote code execution caused by unauthenticated script posting to /run_script endpoint, letting remote attackers execute arbitrary Python code, exploit requires no authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-107204/
---

# CVE-2026-107204 LMCache - Remote Code Execution

LMCache <= 0.5.5 contains a remote code execution caused by unauthenticated script posting to /run\_script endpoint, letting remote attackers execute arbitrary Python code, exploit requires no authentication.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.77% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107204)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

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

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to the latest version beyond 0.5.5.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107204](https://nvd.nist.gov/vuln/detail/CVE-2026-107204)
- [https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-via-run-script-endpoint](https://www.vulncheck.com/advisories/lmcache-through-0.5.5-unauthenticated-rce-via-run-script-endpoint)
- [https://github.com/LMCache/LMCache](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/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/blob/v0.5.5/lmcache/v1/multiprocess/http_apis/common_api.py#L41-L46)
- [https://github.com/LMCache/LMCache/issues/5510](https://github.com/LMCache/LMCache/issues/5510)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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