CVE-2025-43434 - Vulnerability Details

- webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash

Description

A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Published: 2025-11-04

Score: 4.3 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

A use‑after‑free flaw was discovered in WebKitGTK that can be triggered by maliciously crafted web content. Exploitation results in an unexpected Safari crash, which may lead to a denial of service for the affected user session. The weakness is classified as CWE‑416 and does not provide an escape from sandboxed execution or remote code execution.

Affected Systems

Apple’s Safari browser and all related OS platforms—iOS, iPadOS, macOS, visionOS and watchOS—are impacted. The vulnerability is fixed starting with Safari 26.1, iOS and iPadOS 18.7.2, macOS Tahoe 26.1, visionOS 26.1 and watchOS 26.1. Devices running earlier releases of these products are susceptible.

Risk and Exploitability

The CVSS score of 4.3 indicates a moderate impact primarily limited to service interruption. The EPSS score is below 1 %, suggesting that the exploitation probability is very low in the current threat landscape. The vulnerability is not listed in CISA’s KEV catalog. The likely attack vector involves an attacker hosting or supplying malicious web content that a user’s Safari instance parses, leading to a crash. No additional prerequisites beyond normal web browsing are required.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Apple

Safari

affected

Version	Status	Constraints
`0`	affected	< 26.1

Apple

iOS and iPadOS

affected

Version	Status	Constraints
`0`	affected	< 18.7.2
`0`	affected	< 26.1

Apple

macOS

affected

Version	Status	Constraints
`0`	affected	< 26.1

Apple

visionOS

affected

Version	Status	Constraints
`0`	affected	< 26.1

Apple

watchOS

affected

Version	Status	Constraints
`0`	affected	< 26.1

Configuration 1 [-]

OR	cpe:2.3:a:apple:safari::::::::
	cpe:2.3:o:apple:ipados::::::::
	cpe:2.3:o:apple:iphone_os::::::::
	cpe:2.3:o:apple:visionos::::::::
	cpe:2.3:o:apple:watchos::::::::

No data.

Vendor	Product	Confidence	Versions
Apple	Ios	—	—
Apple	Ipados	—	—
Apple	Safari	—	—
Apple	Visionos	—	—
Apple	Watchos	—	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Upgrade all affected Apple devices to versions that include Safari 26.1, iOS 18.7.2, iPadOS 18.7.2, macOS Tahoe 26.1, visionOS 26.1 and watchOS 26.1, ensuring the use‑after‑free fix is applied.
If an immediate system update cannot be performed, implement network‑level or device‑management filtering to block or quarantine URLs known to serve malicious WebKit content, thereby preventing the crash trigger.
After applying the update, reset the WebKit cache and memory by performing a full device reboot to clear any lingering free‑memory references that might still be vulnerable.

Generated by OpenCVE AI on April 22, 2026 at 21:37 UTC.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Debian DLA	DLA-4394-1	webkit2gtk security update
Debian DSA	DSA-6070-1	webkit2gtk security update
Ubuntu USN	USN-7914-1	WebKitGTK vulnerabilities

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00049.

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://nvd.nist.gov/vuln/detail/CVE-2025-43434
https://support.apple.com/en-us/125632
https://support.apple.com/en-us/125633
https://support.apple.com/en-us/125634
https://support.apple.com/en-us/125638
https://support.apple.com/en-us/125639
https://support.apple.com/en-us/125640
https://webkitgtk.org/security/WSA-2025-0008.html
https://www.cve.org/CVERecord?id=CVE-2025-43434

History

Thu, 02 Apr 2026 20:30:00 +0000

Type	Values Removed	Values Added
Description	A use-after-free issue was addressed with improved memory management. This issue is fixed in 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 Safari crash.	A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Wed, 17 Dec 2025 21:00:00 +0000

Type	Values Removed	Values Added
Description	A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2. Processing maliciously crafted web content may lead to an unexpected Safari crash.	A use-after-free issue was addressed with improved memory management. This issue is fixed in 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 Safari crash.
References		https://support.apple.com/en-us/125632 https://support.apple.com/en-us/125634 https://support.apple.com/en-us/125638 https://support.apple.com/en-us/125639 https://support.apple.com/en-us/125640

Sat, 22 Nov 2025 00:15:00 +0000

Type	Values Removed	Values Added
Title		webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash
References		https://nvd.nist.gov/vuln/detail/CVE-2025-43434 https://webkitgtk.org/security/WSA-2025-0008.html https://www.cve.org/CVERecord?id=CVE-2025-43434
Metrics	threat_severity `None`	threat_severity `Important`

Wed, 05 Nov 2025 19:30:00 +0000

Type	Values Removed	Values Added
References	https://support.apple.com/en-us/125632 https://support.apple.com/en-us/125638 https://support.apple.com/en-us/125639 https://support.apple.com/en-us/125640

Wed, 05 Nov 2025 18:45:00 +0000

Type	Values Removed	Values Added
Description	A use-after-free issue was addressed with improved memory management. This issue is fixed in watchOS 26.1, iOS 26.1 and iPadOS 26.1, Safari 26.1, visionOS 26.1. Processing maliciously crafted web content may lead to an unexpected Safari crash.	A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2. Processing maliciously crafted web content may lead to an unexpected Safari crash.
References		https://support.apple.com/en-us/125633

Wed, 05 Nov 2025 14:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Apple iphone Os
CPEs		cpe:2.3:a:apple:safari:::::::: cpe:2.3:o:apple:ipados:::::::: cpe:2.3:o:apple:iphone_os:::::::: cpe:2.3:o:apple:visionos:::::::: cpe:2.3:o:apple:watchos::::::::
Vendors & Products		Apple iphone Os

Tue, 04 Nov 2025 16:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Apple Apple ios Apple ipados Apple safari Apple visionos Apple watchos
Vendors & Products		Apple Apple ios Apple ipados Apple safari Apple visionos Apple watchos

Tue, 04 Nov 2025 14:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416
Metrics		cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 04 Nov 2025 01:45:00 +0000

Type	Values Removed	Values Added
Description		A use-after-free issue was addressed with improved memory management. This issue is fixed in watchOS 26.1, iOS 26.1 and iPadOS 26.1, Safari 26.1, visionOS 26.1. Processing maliciously crafted web content may lead to an unexpected Safari crash.
References		https://support.apple.com/en-us/125632 https://support.apple.com/en-us/125638 https://support.apple.com/en-us/125639 https://support.apple.com/en-us/125640

Subscriptions

Apple Ios Ipados Iphone Os Safari Visionos Watchos

MITRE

Status: PUBLISHED

Assigner: apple

Published: 2025-11-04T01:16:26.023Z

Updated: 2026-04-02T18:15:47.219Z

Reserved: 2025-04-16T15:24:37.124Z

Link: CVE-2025-43434

Vulnrichment

Updated: 2025-11-04T13:14:23.350Z

NVD

Status : Modified

Published: 2025-11-04T02:15:49.260

Modified: 2026-04-02T19:20:46.087

Link: CVE-2025-43434

Redhat

Severity : Important

Publid Date: 2025-11-20T00:00:00Z

Links: CVE-2025-43434 - Bugzilla

OpenCVE Enrichment

Updated: 2026-04-22T21:45:06Z

Weaknesses

CWE-416

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction Required

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object