CVE-2026-64699: A memory initialization issue was addressed with improved memory handling

Q: How do I fix CVE-2026-64699?

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

Q: Is CVE-2026-64699 being exploited?

CVE-2026-64699 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-2026-64699 affect?

CVE-2026-64699 affects macos. Severity is medium (CVSS 5.5). A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to disclose kernel memory.

Q: How urgent is CVE-2026-64699?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-64699 is a medium-severity flaw (CVSS 5.5) affecting macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to disclose kernel memory.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-457
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.

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-2026-64699?

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

Is CVE-2026-64699 being exploited?

CVE-2026-64699 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-2026-64699 affect?

CVE-2026-64699 affects macos. Severity is medium (CVSS 5.5). A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to disclose kernel memory.

How urgent is CVE-2026-64699?

Priority 21/100. No elevated risk signals yet.

Software pages

macOS vulnerabilities

Related CVEs

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
CVE-2026-28982 CRITICAL 9.8 UPGRADE A race condition was addressed with improved locking
CVE-2026-39873 CRITICAL 9.8 UPGRADE The issue was addressed with improved memory handling

References

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