Apple Safari/tvOS/visionOS/watchOS/iOS/iPadOS up to 26.0 Web Content buffer overflow

Summaryinfo

A vulnerability was found in Apple Safari, tvOS, visionOS, watchOS, iOS and iPadOS up to 26.0. It has been rated as critical. Affected by this issue is some unknown functionality of the component Web Content Handler. The manipulation leads to buffer overflow. This vulnerability is traded as CVE-2025-43429. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Apple Safari, tvOS, visionOS, watchOS, iOS and iPadOS up to 26.0 and classified as critical. This issue affects an unknown function of the component Web Content Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is availability. The summary by CVE is:

A buffer overflow was addressed with improved bounds checking. This issue is fixed in tvOS 26.1, watchOS 26.1, macOS Tahoe 26.1, iOS 26.1 and iPadOS 26.1, Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, visionOS 26.1. Processing maliciously crafted web content may lead to an unexpected process crash.

It is possible to read the advisory at support.apple.com. The identification of this vulnerability is CVE-2025-43429 since 04/16/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 12/18/2025).

The vulnerability scanner Nessus provides a plugin with the ID 276579 (Linux Distros Unpatched Vulnerability : CVE-2025-43429), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 26.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (276579) and CERT Bund (WID-SEC-2025-2480). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Apple Safari

Productinfo

Type

• Web Browser

Vendor

• Apple

Name

• iOS
• iPadOS
• Safari
• tvOS
• visionOS
• watchOS

Version

• 26.0

License

• commercial

Website

• Vendor: https://www.apple.com/

CPE 2.3info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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