---
title: "CVE-2026-84565: Apple macOS - Denial of Service"
description: "Apple macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7 contain an out-of-bounds read caused by insufficient bounds checking in disk image processing, letting attackers cause denial of service via app termination, exploit requires processing a malicious disk image."
url: https://panop.io/threat-heartbeat/CVE-2026-84565/
---

# CVE-2026-84565 Apple macOS - Denial of Service

Apple macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7 contain an out-of-bounds read caused by insufficient bounds checking in disk image processing, letting attackers cause denial of service via app termination, exploit requires processing a malicious disk image.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84565)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7 or later.

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-2026-84565](https://nvd.nist.gov/vuln/detail/CVE-2026-84565)
- [https://support.apple.com/en-us/149035](https://support.apple.com/en-us/149035)
- [https://support.apple.com/en-us/149042](https://support.apple.com/en-us/149042)
- [https://support.apple.com/en-us/149043](https://support.apple.com/en-us/149043)

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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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