CVE-2025-43400: Input Validation

Published Sep 29, 2025
·
Updated

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.1 and iPadOS 18.7.1, iOS 26.0.1 and iPadOS 26.0.1, macOS Sequoia 15.7.1, macOS Sonoma 14.8.1, macOS Tahoe 26.0.1, tvOS 26.1, visionOS 26.0.1, watchOS 26.1. Processing a maliciously crafted font may lead to unexpected app termination or corrupt process memory.

Other sources

Apple Account. A privacy issue was addressed with improved checks.

— Apple

Apple Neural Engine. The issue was addressed with improved memory handling.

— Apple

AppleMobileFileIntegrity. This issue was addressed with improved validation of symlinks.

— Apple

Assets. This issue was addressed with improved entitlements.

— Apple

CloudKit. This issue was addressed with improved validation of symlinks.

— Apple

Credit

Apple, Gergely Kalman@@gergely_kalman, JZ, Hikerell (Loadshine Lab), Zhongcheng Li(IES Red Team of ByteDance), Hossein Lotfi@@hosselot(Trend Micro Zero Day Initiative), Cristian Dinca (icmd.tech), Dave G.(supernetworks), Alex Radocea(supernetworks), Michael DePlante@@izobashi(Trend Micro Zero Day Initiative), Aleksejs Popovs, Phil Beauvoir, Google Big Sleep, Gary Kwong, rheza@@ginggilBesel, an anonymous researcher, Justin Cohen(Google), Nan Wang@@eternalsakura13, Tom Van Goethem, Ron Masas(BreakPoint), Pinak Oza, iisBuri, Taavi Eomäe(Zone Media), Romain Lebesle(Khatima), Himanshu Bharti@@Xpl0itme(Khatima), Dalibor Milanovic, @@RenwaX23, Stanislav Jelezoglo, rheza@@ginggilBesel(Trend Micro Zero Day Initiative), shandikri(Trend Micro Zero Day Initiative), Gary Kwong(Trend Micro Zero Day Initiative)

Affected Software

18 affected componentsFixes available
Apple macOS Tahoe<26.0.1
26.0.1
Apple iOS<18.7.1
18.7.1
Apple iPadOS<18.7.1
18.7.1
Apple iOS<26.0.1
26.0.1
Apple iPadOS<26.0.1
26.0.1
Apple visionOS<26.0.1
26.0.1
Apple macOS Sonoma<14.8.1
14.8.1
Apple macOS Sequoia<15.7.1
15.7.1
Apple iPadOS<18.7.1
Apple iPadOS=26.0
Apple iPhone OS<18.7.1
Apple iPhone OS=26.0
Apple macOS>=14.0<14.8.1
Apple macOS>=15.0<15.7.1
Apple macOS=26.0
Apple visionOS<26.0.1
Apple WatchOS<26.1
26.1
Apple tvOS<26.1
26.1

Event History

Sep 29, 2025
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
Affected Software
CVE Published
via MITRE·06:03 PM
Data Sourced
via MITRE·06:03 PM
DescriptionWeakness
Data Sourced
via NVD·06:15 PM
DescriptionSeverityWeaknessAffected Software
Nov 3, 2025
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
Affected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2025-43400?

CVE-2025-43400 has been classified as a high severity vulnerability due to the potential for exploitation that can lead to arbitrary code execution.

2

How do I fix CVE-2025-43400?

You can fix CVE-2025-43400 by updating your system to the latest versions: macOS Sonoma 14.8.1, macOS Tahoe 26.0.1, macOS Sequoia 15.7.1, visionOS 26.0.1, iOS 26.0.1, or iPadOS 26.0.1.

3

Which products are affected by CVE-2025-43400?

The affected products include macOS Tahoe prior to 26.0.1, macOS Sequoia prior to 15.7.1, iOS prior to 26.0.1 and 18.7.1, and iPadOS prior to 26.0.1 and 18.7.1.

4

What kind of attack does CVE-2025-43400 involve?

CVE-2025-43400 involves an out-of-bounds write issue that can be exploited through maliciously crafted fonts.

5

Is there a specific update I need for CVE-2025-43400?

Yes, to resolve CVE-2025-43400, ensure your systems are updated to the specified latest versions mentioned in the security advisories.

Company

Resources

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