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Apple WebKit CVE-2026-43742

| EUVDEUVD-2026-40184 MEDIUM
Use After Free (CWE-416)
2026-06-29 apple GHSA-vjvw-hpgr-cw8j
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

Attack is network-delivered via crafted web content (AV:N, AC:L), requires no attacker privileges (PR:N), demands user page visit (UI:R), and results only in a process crash with no confidentiality or integrity impact (C:N/I:N/A:H).

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:P/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 - 22:33 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 - 19:42 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 29, 2026 - 19:42 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 rendering engine causes unexpected process crashes when processing maliciously crafted web content across Safari, iOS/iPadOS, and macOS Tahoe. All three platform variants prior to the 26.5.2 release train are affected, covering a substantial portion of Apple's consumer and enterprise device fleet. An unauthenticated remote attacker can trigger a denial-of-service condition by enticing a victim to visit a specially crafted webpage; no public exploit code or active exploitation (CISA KEV) has been identified at time of analysis.

Technical ContextAI

CWE-416 (Use After Free) describes a condition where a program continues referencing memory after it has been freed, leading to undefined behavior - commonly a crash, but potentially exploitable for code execution depending on heap layout. In WebKit, the shared browser rendering engine underlying Safari and all iOS/iPadOS WebViews, UAF bugs frequently arise in DOM lifecycle management, JavaScript engine object handling, or CSS rendering pipelines. 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 the shared WebKit codebase as the root component across all three platform variants. Apple's advisory language - 'addressed with improved memory management' - is consistent with introducing stronger object lifetime tracking or ownership checks to prevent the dangling pointer dereference.

RemediationAI

The primary fix is to update to Safari 26.5.2, iOS and iPadOS 26.5.2, or macOS Tahoe 26.5.2, all of which contain Apple's memory management correction for this flaw. Updates are available via the standard Apple Software Update mechanism. Vendor advisories are published at https://support.apple.com/en-us/127594 (Safari), https://support.apple.com/en-us/127595 (iOS/iPadOS), and https://support.apple.com/en-us/127685 (macOS Tahoe). As a compensating control where immediate patching is not possible, consider restricting Safari usage via mobile device management (MDM) profiles to block access to untrusted or external URLs, though this trade-off degrades browser functionality. Enabling Content Security Policy headers on internally hosted web properties does not mitigate client-side rendering bugs of this type.

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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-2026-43742 vulnerability details – vuln.today
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