---
id: CVE-2026-103760
title: >-
  Mooncake transfer engine through 0.3.13.post1 contains a denial of service
  vulnerability that allows unauthenticated remote attackers to block the
  handshake daemon by never reading replies
summary: >-
  Mooncake transfer engine through 0.3.13.post1 contains a denial of service
  vulnerability that allows unauthenticated remote attackers to block the
  handshake daemon by never reading replies. Attackers can send a Metadata
  request to the ha…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
vendor: kvcache-ai
product: Mooncake
affected:
  - Mooncake <= 0.3.13.post1
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T23:16:46.817'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103760'
references:
  - url: 'https://github.com/kvcache-ai/Mooncake'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/kvcache-ai/Mooncake/blob/719735896c86b56fabec6cf3e825fb2ea640597a/mooncake-transfer-engine/src/transfer_metadata_plugin.cpp#L730-L803
    label: disclosure@vulncheck.com
  - url: 'https://github.com/kvcache-ai/Mooncake/issues/4443'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/mooncake-transfer-engine-through-0.3.13-post1-denial-of-service-via-p2p-handshake-daemon-response-write
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T23:03:32.834Z'
---

## Overview

Mooncake transfer engine through 0.3.13.post1 contains a denial of service vulnerability that allows unauthenticated remote attackers to block the handshake daemon by never reading replies. Attackers can send a Metadata request to the handshake RPC port and stall SocketHandShakePlugin's single listener thread in writeFully(), breaking all subsequent handshakes, metadata fetches, notify and probe requests.

## Remediation

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