CVE-2026-43777: This issue was addressed with improved input validation

Q: How do I fix CVE-2026-43777?

macos: upgrade to 14.8.8, 15.7.8, 26.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-43777 being exploited?

CVE-2026-43777 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-2026-43777 affect?

CVE-2026-43777 affects macos. Severity is high (CVSS 7.5). This issue was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A remote attacker may be able to cause a denial of service.

Q: How urgent is CVE-2026-43777?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-43777 is a high-severity flaw (CVSS 7.5) affecting macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This issue was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A remote attacker may be able to cause a denial of service.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-07-27
Last modified	2026-10-24

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

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-27 21:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

apple macos UPGRADE

Affected: >= 14.0 and < 14.8.8 · >= 15.0 and < 15.7.8 · >= 26.0 and < 26.6

Fixed in: 14.8.8, 15.7.8, 26.6

Safe to downgrade to: a release before 14.0

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.

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

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-2026-43777?

macos: upgrade to 14.8.8, 15.7.8, 26.6. Exact commands for each OS are on this page.

Is CVE-2026-43777 being exploited?

CVE-2026-43777 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-2026-43777 affect?

CVE-2026-43777 affects macos. Severity is high (CVSS 7.5). This issue was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A remote attacker may be able to cause a denial of service.

How urgent is CVE-2026-43777?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Software pages

macOS vulnerabilities

Related CVEs

CVE-2026-65400 CRITICAL 9.8 EXPLOITED UPGRADE Apple macOS Improper Authentication Vulnerability
CVE-2026-43715 HIGH 8.8 UPGRADE UPGRADE A use-after-free issue was addressed with improved memory management
CVE-2026-43682 CRITICAL 9.8 UPGRADE The issue was addressed with improved memory handling
CVE-2026-64695 CRITICAL 9.8 UPGRADE The issue was addressed with improved memory handling
CVE-2026-64696 CRITICAL 9.8 UPGRADE The issue was addressed with improved memory handling

References

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