CVE-2026-43659: A race condition was addressed with additional validation

Q: How do I fix CVE-2026-43659?

ipados: upgrade to 18.7.9, 26.5; iphone os: upgrade to 18.7.9, 26.5; macos: upgrade to 14.8.7, 15.7.7, 26.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-43659 being exploited?

CVE-2026-43659 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-2026-43659 affect?

CVE-2026-43659 affects ipados, iphone os, macos. Severity is medium (CVSS 4.7). A race condition was addressed with additional validation. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, visionOS 26.5. An app may be able to acce

Q: How urgent is CVE-2026-43659?

Priority 17/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADEUPGRADEUPGRADE

CVE-2026-43659 is a medium-severity flaw (CVSS 4.7) affecting ipados, iphone os, macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A race condition was addressed with additional validation. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, visionOS 26.5. An app may be able to access sensitive user data.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-362
Published	2026-05-11
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 21:19 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

apple ipados UPGRADE

Affected: < 18.7.9 · >= 26.0 and < 26.5

Fixed in: 18.7.9, 26.5

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: < 18.7.9 · >= 26.0 and < 26.5

Fixed in: 18.7.9, 26.5

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: >= 14.0 and < 14.8.7 · >= 15.0 and < 15.7.7 · >= 26.0 and < 26.5

Fixed in: 14.8.7, 15.7.7, 26.5

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.

apple visionos UPGRADE

Affected: < 26.5

Fixed in: 26.5

Safe to downgrade to: no unaffected older release

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-2026-43659?

ipados: upgrade to 18.7.9, 26.5; iphone os: upgrade to 18.7.9, 26.5; macos: upgrade to 14.8.7, 15.7.7, 26.5. Exact commands for each OS are on this page.

Is CVE-2026-43659 being exploited?

CVE-2026-43659 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-2026-43659 affect?

CVE-2026-43659 affects ipados, iphone os, macos. Severity is medium (CVSS 4.7). A race condition was addressed with additional validation. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, visionOS 26.5. An app may be able to acce

How urgent is CVE-2026-43659?

Priority 17/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · macOS vulnerabilities · iPadOS vulnerabilities

Related CVEs

CVE-2026-43668 HIGH 7.5 UPGRADE UPGRADE A use after free issue was addressed with improved memory management
CVE-2026-28971 MEDIUM 4.3 UPGRADE UPGRADE The issue was addressed with improved UI handling
CVE-2026-28873 HIGH 7.5 UPGRADE UPGRADE This issue was addressed with additional entitlement checks
CVE-2026-28917 MEDIUM 4.3 UPGRADE UPGRADE The issue was addressed with improved input validation
CVE-2026-43715 HIGH 8.8 UPGRADE UPGRADE A use-after-free issue was addressed with improved memory management

References

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