CVE-2026-86926: A heap buffer overflow vulnerability in the FileMaker Server database engine block parsing routine allowed a m

Q: How do I fix CVE-2026-86926?

filemaker server: upgrade to 26.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-86926 being exploited?

CVE-2026-86926 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-86926 affect?

CVE-2026-86926 affects filemaker server. Severity is high (CVSS 7.8). 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 vulnerab

Routine

HIGH 7.8UPGRADE

CVE-2026-86926 is a high-severity flaw (CVSS 7.8) affecting filemaker server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-23
Last modified	2026-10-06

Publisher (CNA): Apple Inc. · Vendor: claris

Last updated 2026-10-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-23 18:17 UTCPublished CVE record published
2026-10-06 13:09 UTCUpdated Record last modified

claris filemaker server UPGRADE

Affected: < 26.0.3

Fixed in: 26.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy filemaker-server || rpm -q filemaker-server || filemaker-server --version

2. UPGRADE to 26.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade filemaker-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade filemaker-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-86926?

filemaker server: upgrade to 26.0.3. Exact commands for each OS are on this page.

Is CVE-2026-86926 being exploited?

CVE-2026-86926 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-86926 affect?

CVE-2026-86926 affects filemaker server. Severity is high (CVSS 7.8). 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 vulnerab

How urgent is CVE-2026-86926?

Priority 28/100. High severity

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References

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