CVE-2026-84595: An out-of-bounds write issue was addressed with improved bounds checking

Q: How do I fix CVE-2026-84595?

ipados: upgrade to 27.0; iphone os: upgrade to 27.0; macos: upgrade to 15.8.2, 26.7.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-84595 being exploited?

CVE-2026-84595 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-2026-84595 affect?

CVE-2026-84595 affects ipados, iphone os, macos. Severity is medium (CVSS 5.5). An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, visionOS 27. An app may be able to cause unexpected syste

Q: How urgent is CVE-2026-84595?

Priority 22/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADEUPGRADEUPGRADE

CVE-2026-84595 is a medium-severity flaw (CVSS 5.5) affecting ipados, iphone os, macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, visionOS 27. An app may be able to cause unexpected system termination.

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	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-10-26
Last modified	2026-11-02

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

Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-26 21:20 UTCPublished CVE record published
2026-11-02 15:45 UTCUpdated Record last modified

apple ipados UPGRADE

Affected: < 27.0

Fixed in: 27.0

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.

apple iphone os UPGRADE

Affected: < 27.0

Fixed in: 27.0

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.

apple macos UPGRADE

Affected: >= 15.0 and < 15.8.2 · >= 26.0 and < 26.7.2

Fixed in: 15.8.2, 26.7.2

Safe to downgrade to: a release before 15.0

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: < 27.0

Fixed in: 27.0

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.

Advisories and coverage

Research and news

Vulners Bulletins: CVE-2026-84595 2026-10-26

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-2026-84595?

ipados: upgrade to 27.0; iphone os: upgrade to 27.0; macos: upgrade to 15.8.2, 26.7.2. Exact commands for each OS are on this page.

Is CVE-2026-84595 being exploited?

CVE-2026-84595 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-2026-84595 affect?

CVE-2026-84595 affects ipados, iphone os, macos. Severity is medium (CVSS 5.5). An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, visionOS 27. An app may be able to cause unexpected syste

How urgent is CVE-2026-84595?

Priority 22/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · macOS vulnerabilities · iPadOS vulnerabilities

Related CVEs

CVE-2026-84599 HIGH 7.8 UPGRADE UPGRADE The issue was addressed with improved memory handling
CVE-2026-84594 MEDIUM 5.5 UPGRADE UPGRADE A logic issue was addressed with improved state management
CVE-2026-113907 MEDIUM 6.1 UPGRADE UPGRADE A buffer overflow issue was addressed with improved memory handling
CVE-2026-113896 MEDIUM 4.7 UPGRADE UPGRADE A race condition was addressed with additional validation
CVE-2026-112706 MEDIUM 5.5 UPGRADE UPGRADE A permissions issue was addressed with additional restrictions

References

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