---
title: "CVE-2026-91041: Embedded System FAT Image Mounting - Buffer Overflow"
description: "An embedded system with FAT image mounting and fault tolerance enabled contains a buffer overflow caused by out-of-bounds heap write during log replay, letting attackers achieve control of instruction pointer, exploit requires attacker-controlled FAT image."
url: https://panop.io/threat-heartbeat/CVE-2026-91041/
---

# CVE-2026-91041 Embedded System FAT Image Mounting - Buffer Overflow

An embedded system with FAT image mounting and fault tolerance enabled contains a buffer overflow caused by out-of-bounds heap write during log replay, letting attackers achieve control of instruction pointer, exploit requires attacker-controlled FAT image.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91041)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

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

Published

20 October 2026

Updated

20 October 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to the latest version with patched FAT image handling and fault tolerance.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91041](https://nvd.nist.gov/vuln/detail/CVE-2026-91041)
- [https://github.com/eclipse-threadx/filex/security/advisories/GHSA-c8cj-fj9j-426v](https://github.com/eclipse-threadx/filex/security/advisories/GHSA-c8cj-fj9j-426v)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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