Apple macOS/visionOS/iOS/iPadOS up to 18.7.0/26.0 Font out-of-bounds write

Summaryinfo

A vulnerability was found in Apple macOS, visionOS, iOS and iPadOS up to 18.7.0/26.0 and classified as critical. This vulnerability affects unknown code of the component Font Handler. The manipulation results in out-of-bounds write. This vulnerability is cataloged as CVE-2025-43400. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apple macOS, visionOS, iOS and iPadOS up to 18.7.0/26.0. It has been classified as critical. Affected is an unknown code of the component Font Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is available at support.apple.com. This vulnerability is traded as CVE-2025-43400 since 04/16/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $25k-$100k at the moment (estimation calculated on 09/30/2025).

The vulnerability scanner Nessus provides a plugin with the ID 266090 (macOS 14.x < 14.8.1 (125330)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 18.7.1 or 26.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (266090) and CERT Bund (WID-SEC-2025-2157). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Apple iOS
• Apple iPadOS
• Apple macOS

Productinfo

Type

• Smartphone Operating System

Vendor

• Apple

Name

• iOS
• iPadOS
• macOS
• visionOS

Version

• 18.0
• 18.1
• 18.2
• 18.3
• 18.4
• 18.5
• 18.6
• 18.7.0
• 26.0

License

• commercial

Website

• Vendor: https://www.apple.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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