A heap buffer overflow vulnerability in the FileMaker Server database engine block parsing routine allowed a maliciously crafted .

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.

CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity from

no source yet

Weakness

CWE-122

• www.cve.org/CVERecord?id=CVE-2026-86926
• nvd.nist.gov/vuln/detail/CVE-2026-86926
• support.claris.com/s/answerview?anum=000049219&language=en_US