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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
Memory Corruption Apple Denial Of Service Use After Free 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

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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
MEDIUM 6.5
CVE Published
Jun 29, 2026 - 19:43 cve.org
UNKNOWN (no severity yet)

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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts maliciously crafted web page
Delivery
Victim clicks link or is redirected to page
Exploit
WebKit begins parsing crafted web content
Execution
Use-after-free triggered in memory management subsystem
Impact
Safari or WebKit process crashes unexpectedly
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Vulnerability AssessmentAI

Exploitation Exploitation requires a user to actively load or process maliciously crafted web content in a WebKit-based browser on an affected Apple device - any version of Safari on macOS Tahoe prior to 26.5.2, or any browser (including Chrome and Firefox, which must use WebKit on the platform) on iOS or iPadOS prior to 26.5.2. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 6.5 (Medium) with vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H accurately reflects the threat profile: the attack is network-delivered with low complexity and no authentication requirement, but requires the victim to actively process malicious web content (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a webpage embedding web content specifically designed to trigger the use-after-free condition in WebKit's memory allocator. The victim is directed to this page via a phishing link, malvertising redirect, or compromised website, and upon loading the content in Safari or any WebKit-based browser on an unpatched Apple device, the browser process crashes abruptly. …
Remediation Vendor-released patch: Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, and macOS Tahoe 26.5.2. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-43726 vulnerability details – vuln.today
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