CVE-2026-64779: A memory corruption vulnerability was addressed with improved locking

Q: How do I fix CVE-2026-64779?

ipados: upgrade to 18.7.10, 26.6.1; iphone os: upgrade to 18.7.10, 26.6.1; macos: upgrade to 26.6.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-64779 being exploited?

CVE-2026-64779 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-2026-64779 affect?

CVE-2026-64779 affects ipados, iphone os, macos. Severity is low (CVSS 3.1). A memory corruption vulnerability was addressed with improved locking. This issue is fixed in Safari 26.6.1, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2, visionOS 27. Processing maliciously crafted web c

Q: How urgent is CVE-2026-64779?

Priority 19/100. No elevated risk signals yet.

Routine

LOW 3.1UPGRADEUPGRADEUPGRADE

CVE-2026-64779 is a low-severity flaw (CVSS 3.1) affecting ipados, iphone os, macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in Safari 26.6.1, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2, visionOS 27. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-362
Published	2026-08-17
Last modified	2026-09-14

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

Last updated 2026-09-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-17 22:17 UTCPublished CVE record published
2026-09-14 21:17 UTCUpdated Record last modified

apple ipados UPGRADE

Affected: < 18.7.10 · >= 26.0 and < 26.6.1

Fixed in: 18.7.10, 26.6.1

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.

apple iphone os UPGRADE

Affected: < 18.7.10 · >= 26.0 and < 26.6.1

Fixed in: 18.7.10, 26.6.1

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.

apple macos UPGRADE

Affected: >= 26.0 and < 26.6.2

Fixed in: 26.6.2

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.

Advisories and coverage

Official advisories

Amazon Linux 2 ALAS: ALAS2-2026-3917 (important): webkitgtk4 2026-09-14

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-2026-64779?

ipados: upgrade to 18.7.10, 26.6.1; iphone os: upgrade to 18.7.10, 26.6.1; macos: upgrade to 26.6.2. Exact commands for each OS are on this page.

Is CVE-2026-64779 being exploited?

CVE-2026-64779 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-2026-64779 affect?

CVE-2026-64779 affects ipados, iphone os, macos. Severity is low (CVSS 3.1). A memory corruption vulnerability was addressed with improved locking. This issue is fixed in Safari 26.6.1, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2, visionOS 27. Processing maliciously crafted web c

How urgent is CVE-2026-64779?

Priority 19/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · macOS vulnerabilities · Safari vulnerabilities · Apple Safari and WebKit vulnerabilities · iPadOS vulnerabilities

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References

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