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Apple WebKit CVE-2026-43726

| EUVDEUVD-2026-40209 MEDIUM
Use After Free (CWE-416)
2026-06-29 apple GHSA-fq4m-7frw-qjqf
Denial Of Service Use After Free Memory Corruption Apple Ios And Ipados
6.5
CVSS 3.1 · Vendor: apple
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Severity by source

Vendor (apple) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Web content is network-delivered with no auth needed, but UI:R is required; crash-only outcome yields C:N/I:N/A:H with no scope change.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 29, 2026 - 22:40 vuln.today
CVSS changed
Jun 29, 2026 - 22:22 NVD
6.5 (MEDIUM)
Patch available
Jun 29, 2026 - 22:02 EUVD
CVE Published
Jun 29, 2026 - 19:43 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 29, 2026 - 19:43 cve.org
MEDIUM 6.5

DescriptionCVE.org

A use-after-free issue was addressed with improved memory management. 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.

AnalysisAI

Use-after-free memory corruption in Apple's WebKit browser engine causes an unexpected process crash when rendering maliciously crafted web content. Safari (all versions prior to 26.5.2), iOS and iPadOS (all versions prior to 26.5.2), and macOS Tahoe (all versions prior to 26.5.2) are affected across Apple's full consumer device ecosystem. No public exploit or CISA KEV listing exists at time of analysis; impact is confirmed as denial-of-service (process crash) only, with no confidentiality or integrity compromise.

Technical ContextAI

WebKit is Apple's open-source browser rendering engine that underpins Safari on macOS and, by Apple App Store policy, all third-party browsers on iOS and iPadOS. CWE-416 (Use After Free) describes a class of memory safety flaw where a program continues to reference memory after it has been freed, leading to undefined behavior - typically a crash or, in more severe cases, exploitable memory corruption. In this instance, the freed memory is accessed during parsing or rendering of web content, triggering an unexpected process crash. The affected CPE strings (cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*, cpe:2.3:a:apple:ios_and_ipados:*:*:*:*:*:*:*:*, cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*) confirm exposure across Apple's three primary platform surfaces. Apple's own security advisory language - 'addressed with improved memory management' - is consistent with a use-after-free fix.

RemediationAI

Vendor-released patch: Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, and macOS Tahoe 26.5.2. Apple has released updates for all three affected platforms, documented at https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. Apply updates via Software Update on macOS (System Settings > General > Software Update) or Settings > General > Software Update on iOS and iPadOS. As a compensating control for environments unable to update immediately, restricting user access to untrusted or unknown web URLs via a proxy or DNS filtering layer can reduce exposure, at the cost of user friction and incomplete coverage. Since the confirmed impact is a process crash (DoS) rather than code execution, the operational urgency for workarounds is moderate - prioritize patch deployment during the next normal maintenance cycle unless specific high-value targets (unmanaged iOS devices, public-facing kiosk deployments) warrant faster action.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected

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CVE-2026-43726 vulnerability details – vuln.today
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