CVE-2026-84579: A logic issue was addressed with improved checks

Q: How do I fix CVE-2026-84579?

macos: upgrade to 15.8, 26.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-84579 being exploited?

CVE-2026-84579 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-2026-84579 affect?

CVE-2026-84579 affects macos. Severity is high (CVSS 8.8). A logic issue was addressed with improved checks. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Opening a file referencing a network share may lead to unexpected software execution.

This month

HIGH 8.8UPGRADE

CVE-2026-84579 is a high-severity flaw (CVSS 8.8) affecting macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A logic issue was addressed with improved checks. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Opening a file referencing a network share may lead to unexpected software execution.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-703
Published	2026-10-20
Last modified	2026-11-03

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

Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-20 01:17 UTCPublished CVE record published
2026-11-03 21:10 UTCUpdated Record last modified

apple macos UPGRADE

Affected: < 15.8 · >= 26.0 and < 26.7

Fixed in: 15.8, 26.7

Safe to downgrade to: a release before 26.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2026-84579?

macos: upgrade to 15.8, 26.7. Exact commands for each OS are on this page.

Is CVE-2026-84579 being exploited?

CVE-2026-84579 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-2026-84579 affect?

CVE-2026-84579 affects macos. Severity is high (CVSS 8.8). A logic issue was addressed with improved checks. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Opening a file referencing a network share may lead to unexpected software execution.

How urgent is CVE-2026-84579?

Priority 42/100. High severity

Software pages

macOS vulnerabilities

Related CVEs

CVE-2026-112424 HIGH 7.1 UPGRADE An out-of-bounds read was addressed with improved bounds checking
CVE-2026-112425 LOW 3.3 UPGRADE UPGRADE An out-of-bounds read was addressed with improved bounds checking
CVE-2026-112428 MEDIUM 5.5 UPGRADE A logic issue was addressed with improved checks
CVE-2026-112429 MEDIUM 5.5 UPGRADE An out-of-bounds read was addressed with improved bounds checking
CVE-2026-112430 HIGH 7.8 UPGRADE An authentication issue was addressed with improved validation of user attributes

References

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