CVE-2026-28954: A file quarantine bypass was addressed with additional checks

Q: How do I fix CVE-2026-28954?

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

Q: Is CVE-2026-28954 being exploited?

CVE-2026-28954 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-2026-28954 affect?

CVE-2026-28954 affects ipados, iphone os, macos. Severity is high (CVSS 7.5). A file quarantine bypass was addressed with additional checks. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. A maliciously crafted disk image may bypass Gatekeeper checks.

Q: How urgent is CVE-2026-28954?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-28954 is a high-severity flaw (CVSS 7.5) affecting ipados, iphone os, macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A file quarantine bypass was addressed with additional checks. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. A maliciously crafted disk image may bypass Gatekeeper checks.

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	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-290
Published	2026-05-11
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 21:18 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

apple ipados UPGRADE

Affected: < 18.7.9

Fixed in: 18.7.9

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: < 18.7.9

Fixed in: 18.7.9

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: >= 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.

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-2026-28954?

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

Is CVE-2026-28954 being exploited?

CVE-2026-28954 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-2026-28954 affect?

CVE-2026-28954 affects ipados, iphone os, macos. Severity is high (CVSS 7.5). A file quarantine bypass was addressed with additional checks. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. A maliciously crafted disk image may bypass Gatekeeper checks.

How urgent is CVE-2026-28954?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Software pages

iOS vulnerabilities · macOS vulnerabilities · iPadOS vulnerabilities

Related CVEs

CVE-2026-43661 HIGH 7.5 UPGRADE UPGRADE A buffer overflow issue was addressed with improved memory handling
CVE-2026-28972 MEDIUM 6.5 UPGRADE UPGRADE An out-of-bounds write issue was addressed with improved input validation
CVE-2026-28846 HIGH 7.5 UPGRADE UPGRADE A buffer overflow was addressed with improved bounds checking
CVE-2026-28952 HIGH 7.5 UPGRADE UPGRADE An integer overflow was addressed with improved input validation
CVE-2026-28983 HIGH 7.5 UPGRADE UPGRADE A type confusion issue was addressed with improved checks

References

← Back to latest CVEs