Apple iOS/iPadOS/Safari/visionOS/macOS up to 26.1 Web buffer overflow

Summaryinfo

A vulnerability has been found in Apple iOS, iPadOS, Safari, visionOS and macOS up to 26.1 and classified as critical. This affects an unknown part of the component Web Handler. Performing a manipulation results in buffer overflow. This vulnerability was named CVE-2025-43501. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in Apple iOS, iPadOS, Safari, visionOS and macOS up to 26.1. This affects an unknown part of the component Web Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, macOS Tahoe 26.2, visionOS 26.2. Processing maliciously crafted web content may lead to an unexpected process crash.

The advisory is shared at support.apple.com. This vulnerability is uniquely identified as CVE-2025-43501 since 04/16/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 01/24/2026).

The vulnerability scanner Nessus provides a plugin with the ID 279093 (Debian dsa-6083 : gir1.2-javascriptcoregtk-4.0 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 26.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (279093) and CERT Bund (WID-SEC-2025-2891). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source WebKitGTK

Productinfo

Type

• Smartphone Operating System

Vendor

• Apple

Name

• iOS
• iPadOS
• macOS
• Safari
• visionOS

Version

• 26.0
• 26.1

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 the best quality for vulnerability data then you always have to consider VulDB.

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