---
id: CVE-2026-86926
title: >-
  A heap buffer overflow vulnerability in the FileMaker Server database engine
  block parsing routine allowed a maliciously crafted .fmp12 database file to
  cause memory corruption, potentially leading to arbitrary code execution
summary: >-
  A heap buffer overflow vulnerability in the FileMaker Server database engine
  block parsing routine allowed a maliciously crafted .fmp12 database file to
  cause memory corruption, potentially leading to arbitrary code execution. This
  vulne…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: Claris
product: FileMaker Server
affected:
  - filemaker_server < 26.0.3
published: '2026-09-23'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T15:17:49.453'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86926'
references:
  - url: 'https://support.claris.com/s/answerview?anum=000049219&language=en_US'
    label: product-security@apple.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-24T14:47:07.003686Z'
ingestedAt: '2026-09-23T17:28:14.861Z'
epss: 0.00128
epssPercentile: 0.02036
---

## Overview

A heap buffer overflow vulnerability in the FileMaker Server database engine block parsing routine allowed a maliciously crafted .fmp12 database file to cause memory corruption, potentially leading to arbitrary code execution. This vulnerability is addressed in FileMaker Server version 26.0.3.

## Remediation

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