---
id: CVE-2026-107205
title: >-
  LMCache through 0.5.5 contains a missing authentication vulnerability in the
  multiprocess coordinator that allows remote unauthenticated attackers to
  access its HTTP fleet control API listening on all interfaces by default
summary: >-
  LMCache through 0.5.5 contains a missing authentication vulnerability in the
  multiprocess coordinator that allows remote unauthenticated attackers to
  access its HTTP fleet control API listening on all interfaces by default.
  Attackers can…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-306
vendor: LMCache
product: LMCache
affected:
  - LMCache <= 0.5.5
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T17:16:53.790'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107205'
references:
  - url: 'https://github.com/LMCache/LMCache'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp_coordinator/app.py#L238-L246
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/mp_coordinator/config.py#L71
    label: disclosure@vulncheck.com
  - url: 'https://github.com/LMCache/LMCache/issues/5508'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/lmcache-through-0.5.5-missing-authentication-in-mp-coordinator-fleet-control-api
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-07T16:06:00.350584Z'
ingestedAt: '2026-10-07T16:38:22.224Z'
---

## Overview

LMCache through 0.5.5 contains a missing authentication vulnerability in the multiprocess coordinator that allows remote unauthenticated attackers to access its HTTP fleet control API listening on all interfaces by default. Attackers can register or deregister instances via /instances, overwrite quotas via /quota endpoints, inject events via /events, and enumerate /directory/keys to disrupt caching and disclose placement metadata.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.