---
title: "CVE-2026-107205: LMCache - Authentication Bypass"
description: "LMCache through 0.5.5 contains a missing authentication vulnerability in the multiprocess coordinator's HTTP fleet control API, letting remote unauthenticated attackers access and manipulate instances, quotas, events, and directory keys, exploit requires default API exposure on all interfaces."
url: https://panop.io/threat-heartbeat/CVE-2026-107205/
---

# CVE-2026-107205 LMCache - Authentication Bypass

LMCache through 0.5.5 contains a missing authentication vulnerability in the multiprocess coordinator's HTTP fleet control API, letting remote unauthenticated attackers access and manipulate instances, quotas, events, and directory keys, exploit requires default API exposure on all interfaces.

CVSS base score 8.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.39% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107205)

## Details

Type

Authentication Bypass

Impact

Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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-2026-107205](https://nvd.nist.gov/vuln/detail/CVE-2026-107205)
- [https://github.com/LMCache/LMCache](https://github.com/LMCache/LMCache)
- [https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp\_coordinator/app.py#L238-L246](https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp_coordinator/app.py#L238-L246)
- [https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp\_coordinator/config.py#L71](https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp_coordinator/config.py#L71)
- [https://github.com/LMCache/LMCache/issues/5508](https://github.com/LMCache/LMCache/issues/5508)
- [https://www.vulncheck.com/advisories/lmcache-through-0.5.5-missing-authentication-in-mp-coordinator-fleet-control-api](https://www.vulncheck.com/advisories/lmcache-through-0.5.5-missing-authentication-in-mp-coordinator-fleet-control-api)

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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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