CVE-2026-43663 - Vulnerability Details

- webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash

Description

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected process crash.

Published: 2026-06-29

Score: 6.5 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

A flaw in Apple’s memory handling for web content processing can cause an unexpected crash of Safari, iOS, iPadOS, macOS, tvOS, visionOS, or watchOS browsers or system processes. Serving specially crafted web pages can trigger this condition, resulting in a denial of service where the affected application or system becomes unavailable. No direct impact on confidentiality or integrity is described, and the vulnerability is limited to service disruption on the affected platform.

Affected Systems

The defect is present in Apple’s Safari browser, iOS, iPadOS, and macOS Tahoe before version 26.5.2. The fixes are incorporated in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6, which all contain improved memory handling for web content.

Risk and Exploitability

EPSS score is < 1% and the vulnerability is not listed in the CISA KEV catalog, indicating a low exploitation probability. However, a typical attack would involve a remote actor delivering malicious web content to a user’s browser, making the exploitation vector likely remote over HTTP(S). The CVSS score of 6.5 indicates moderate risk.

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	< 26.5.2

Apple

iOS and iPadOS

affected

Version	Status	Constraints
`0`	affected	< 26.5.2

Apple

macOS

affected

Version	Status	Constraints
`0`	affected	< 26.5.2

Apple

tvOS

affected

Version	Status	Constraints
`0`	affected	< 26.6

Apple

visionOS

affected

Version	Status	Constraints
`0`	affected	< 26.6

Apple

watchOS

affected

Version	Status	Constraints
`0`	affected	< 26.6

No data.

Vendor Product Confidence Versions

Apple

Ios And Ipados

100%

Version	Status	Scheme	Platform
`[0,26.5.2)`	affected	semver	—

Apple

Macos

100%

Version	Status	Scheme	Platform
`[0,26.5.2)`	affected	semver	—

Apple

Safari

100%

Version	Status	Scheme	Platform
`[0,26.5.2)`	affected	semver	—

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

Update Safari to version 26.5.2 or later, or later iOS/iPadOS releases that include the memory handling fix.
If an immediate software update is not feasible, use web-filtering or parental‑control solutions to block sites serving malicious content until the update is applied.
For macOS Tahoe users, consider upgrading to a newer macOS release that supersedes version 26.5.2 to maintain ongoing support and security patches.

Generated by OpenCVE AI on August 4, 2026 at 08:16 UTC.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Debian DSA	DSA-6398-1	webkit2gtk security update

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00244.

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://bugs.webkit.org/show_bug.cgi?id=312781
https://nvd.nist.gov/vuln/detail/CVE-2026-43663
https://support.apple.com/en-us/127594
https://support.apple.com/en-us/127595
https://support.apple.com/en-us/127685
https://support.apple.com/en-us/128068
https://support.apple.com/en-us/128069
https://support.apple.com/en-us/128070
https://webkitgtk.org/security/WSA-2026-0004.html
https://www.cve.org/CVERecord?id=CVE-2026-43663

History

Mon, 27 Jul 2026 20:30:00 +0000

Type	Values Removed	Values Added
Description	The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected process crash.	The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected process crash.
References		https://support.apple.com/en-us/128068 https://support.apple.com/en-us/128069 https://support.apple.com/en-us/128070

Fri, 17 Jul 2026 00:15:00 +0000

Type	Values Removed	Values Added
Title	Safari and iOS memory handling flaw causing application crash	webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
References		https://bugs.webkit.org/show_bug.cgi?id=312781 https://nvd.nist.gov/vuln/detail/CVE-2026-43663 https://webkitgtk.org/security/WSA-2026-0004.html https://www.cve.org/CVERecord?id=CVE-2026-43663
Metrics	threat_severity `None`	threat_severity `Moderate`

Tue, 30 Jun 2026 03:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Apple Apple ios And Ipados Apple macos Apple safari
Vendors & Products		Apple Apple ios And Ipados Apple macos Apple safari

Tue, 30 Jun 2026 02:00:00 +0000

Type	Values Removed	Values Added
Title		Safari and iOS memory handling flaw causing application crash

Tue, 30 Jun 2026 00:15:00 +0000

Type	Values Removed	Values Added
Title	Safari, iOS, iPadOS, and macOS Process Crash from Malicious Web Content
Weaknesses	CWE-122 CWE-788

Mon, 29 Jun 2026 22:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-119 CWE-416
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mon, 29 Jun 2026 21:45:00 +0000

Type	Values Removed	Values Added
Title		Safari, iOS, iPadOS, and macOS Process Crash from Malicious Web Content
Weaknesses		CWE-122 CWE-788

Mon, 29 Jun 2026 20:15:00 +0000

Type	Values Removed	Values Added
Description		The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected process crash.
References		https://support.apple.com/en-us/127594 https://support.apple.com/en-us/127595 https://support.apple.com/en-us/127685

Subscriptions

Apple Ios And Ipados Macos Safari

MITRE

Status: PUBLISHED

Assigner: apple

Published: 2026-06-29T19:43:05.979Z

Updated: 2026-07-27T20:14:10.847Z

Reserved: 2026-05-01T22:46:21.639Z

Link: CVE-2026-43663

Vulnrichment

Updated: 2026-06-29T21:48:08.808Z

NVD

No data.

Redhat

Severity : Moderate

Publid Date: 2026-07-10T00:00:00Z

Links: CVE-2026-43663 - Bugzilla

OpenCVE Enrichment

Updated: 2026-08-04T08:30:05Z

Weaknesses

CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-416
Use After Free

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 High

User Interaction Required

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object