---
id: CVE-2026-85441
title: >-
  MOOS core-moos through 10.4.0 fails to validate that serialized string lengths
  are non-negative in CMOOSMsg::operator>>
summary: >-
  MOOS core-moos through 10.4.0 fails to validate that serialized string lengths
  are non-negative in CMOOSMsg::operator>>. Unauthenticated attackers can send a
  crafted message with a negative length value to the MOOSDB port, causing an
  unh…
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-195
published: '2026-09-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:07:17.943'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85441'
references:
  - url: 'https://github.com/themoos/core-moos'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/themoos/core-moos/blob/ec9c77c68fcbdef8f5e4c60fe243acd223433f0c/Core/libMOOS/Comms/MOOSMsg.cpp#L453
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/themoos/core-moos/commit/04c92981091fdaa2ff85e2ba7eff94f6288bdbaf
    label: disclosure@vulncheck.com
  - url: 'https://github.com/themoos/core-moos/pull/74'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/moos-core-moos-through-10.4.0-moosdb-denial-of-service-via-negative-serialized-string-length
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00658
epssPercentile: 0.49285
ingestedAt: '2026-09-08T20:10:03.161Z'
---

## Overview

MOOS core-moos through 10.4.0 fails to validate that serialized string lengths are non-negative in CMOOSMsg::operator>>. Unauthenticated attackers can send a crafted message with a negative length value to the MOOSDB port, causing an unhandled exception that terminates the database process.

## Remediation

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