Apple Safari up to 18.4 Web use after free

Summaryinfo

A vulnerability was found in Apple Safari. It has been rated as critical. The impacted element is an unknown function of the component Web Handler. This manipulation causes use after free. This vulnerability is handled as CVE-2025-43368. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Apple Safari. It has been declared as critical. Affected by this vulnerability is an unknown function of the component Web Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability. The summary by CVE is:

A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26, macOS Tahoe 26, iOS 26 and iPadOS 26. Processing maliciously crafted web content may lead to an unexpected Safari crash.

It is possible to read the advisory at support.apple.com. This vulnerability is known as CVE-2025-43368 since 04/16/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. 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 01/25/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265819 (Fedora 42 : webkitgtk (2025-fcc043d407)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 26.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (265819) and CERT Bund (WID-SEC-2025-2104). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

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

Productinfo

Type

• Web Browser

Vendor

• Apple

Name

• Safari

Version

• 0.8
• 0.9
• 1.0
• 1.0.0
• 1.0.0b1
• 1.0.0b2
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0b1
• 1.1
• 1.1.0
• 1.1.1
• 1.2
• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.3
• 1.3.0
• 1.3.1
• 1.3.2
• 2
• 2.0
• 2.0 Pre
• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.3 417.9.3
• 2.0.4
• 2.0.4 419.3
• 3
• 3.0
• 3.0.0
• 3.0.0b
• 3.0.1
• 3.0.1b
• 3.0.2
• 3.0.2b
• 3.0.3
• 3.0.3b
• 3.0.4
• 3.0.4 Beta
• 3.0.4b
• 3.1
• 3.1.0
• 3.1.0b
• 3.1.1
• 3.1.2
• 3.2
• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 4
• 4.0
• 4.0 Beta
• 4.0.0b
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.1
• 4.1.1
• 4.1.2
• 4.1.3
• 5
• 5.0
• 5.0.1
• 5.0.5
• 5.0.6
• 5.1
• 5.1.2
• 5.1.2 (7534.52.7)
• 5.1.4
• 5.1.7
• 6
• 6.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.1
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.6
• 6.2.7
• 6.2.8
• 7.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 8
• 8.0
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5
• 8.0.6
• 8.0.7
• 8.0.8
• 9.0
• 9.0.1
• 9.0.2
• 9.0.3
• 9.1
• 9.1.1
• 9.1.2
• 10
• 10.0
• 10.0.1
• 10.0.2
• 10.0.3
• 10.1
• 10.1.1
• 10.1.2
• 10.5
• 10.5.3
• 10.5.6
• 10.5.8
• 11
• 11.0
• 11.0.1
• 11.0.2
• 11.0.3
• 11.1
• 11.1.1
• 11.1.2
• 12.0
• 12.0.1
• 12.0.2
• 12.0.3
• 12.1
• 12.1.1
• 12.1.2
• 13.0
• 13.0.1
• 13.0.2
• 13.0.3
• 13.0.5
• 13.1
• 13.1.1
• 13.1.2
• 14.0
• 14.0.1
• 14.0.2
• 14.0.3
• 14.1
• 14.1.1
• 14.1.2
• 15
• 15.0
• 15.1
• 15.2
• 15.3
• 15.4
• 15.5
• 15.6
• 15.6.1
• 16
• 16.0
• 16.1
• 16.2
• 16.3
• 16.3.1
• 16.4
• 16.4.1
• 16.5
• 16.5.1
• 16.6
• 17
• 18.1
• 18.4

License

• commercial

Website

• Vendor: https://www.apple.com/

CPE 2.3info

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Threat Intelligenceinfo

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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