---
id: CVE-2026-85443
title: >-
  MOOS core-moos through 10.4.0 contains a denial of service vulnerability in
  MOOSCommServer::ListenLoop() where the accept thread performs a blocking
  receive without timeout during the wire-protocol handshake
summary: >-
  MOOS core-moos through 10.4.0 contains a denial of service vulnerability in
  MOOSCommServer::ListenLoop() where the accept thread performs a blocking
  receive without timeout during the wire-protocol handshake. An attacker can
  open a TCP c…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
vendor: themoos
product: core-moos
affected:
  - core-moos <= 10.4.0
published: '2026-09-03'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T14:17:14.143'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85443'
references:
  - url: 'https://github.com/themoos/core-moos'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/themoos/core-moos/blob/ec9c77c68fcbdef8f5e4c60fe243acd223433f0c/Core/libMOOS/Comms/MOOSCommServer.cpp#L922
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/themoos/core-moos/commit/8d940303949a850d4625eca2a60f27adee9c3ec4
    label: disclosure@vulncheck.com
  - url: 'https://github.com/themoos/core-moos/pull/83'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/moos-core-moos-through-10.4.0-moosdb-accept-loop-denial-of-service
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T13:08:33.843456Z'
epss: 0.0035
epssPercentile: 0.28756
ingestedAt: '2026-09-08T20:10:03.161Z'
---

## Overview

MOOS core-moos through 10.4.0 contains a denial of service vulnerability in MOOSCommServer::ListenLoop() where the accept thread performs a blocking receive without timeout during the wire-protocol handshake. An attacker can open a TCP connection to the MOOSDB port and send no data, causing the accept thread to block indefinitely while holding the socket-list lock, preventing all subsequent client connections.

## Remediation

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