---
id: CVE-2026-103765
title: >-
  Mooncake through 0.3.13.post1 contains a missing authentication vulnerability
  in the HTTP metadata server /metadata handler that allows unauthenticated
  attackers to read, overwrite, and delete transfer engine metadata keys
summary: >-
  Mooncake through 0.3.13.post1 contains a missing authentication vulnerability
  in the HTTP metadata server /metadata handler that allows unauthenticated
  attackers to read, overwrite, and delete transfer engine metadata keys.
  Attackers can…
severity: critical
cvss: 9.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H'
cwe:
  - CWE-306
vendor: kvcache-ai
product: Mooncake
affected:
  - Mooncake <= 0.3.13.post1
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T00:16:59.663'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103765'
references:
  - url: 'https://github.com/kvcache-ai/Mooncake'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/kvcache-ai/Mooncake/blob/719735896c86b56fabec6cf3e825fb2ea640597a/mooncake-wheel/mooncake/http_metadata_server.py#L61-L106
    label: disclosure@vulncheck.com
  - url: 'https://github.com/kvcache-ai/Mooncake/issues/4444'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/mooncake-through-0.3.13-post1-missing-authentication-in-http-metadata-server
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T00:04:54.728Z'
---

## Overview

Mooncake through 0.3.13.post1 contains a missing authentication vulnerability in the HTTP metadata server /metadata handler that allows unauthenticated attackers to read, overwrite, and delete transfer engine metadata keys. Attackers can poison segment descriptors such as tcp_data_port or re-create rpc_meta entries to redirect KV cache transfers to attacker-controlled listeners, or exhaust server memory.

## Remediation

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