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Apple Safari CVE-2026-43727

| EUVDEUVD-2026-40205 MEDIUM
Use After Free (CWE-416)
2026-06-29 apple GHSA-7gjf-r94h-p24f
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

Network-reachable via web page visit with no privileges required; user must actively browse to content; impact is crash only, with no confidentiality or integrity compromise confirmed.

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 - 22:38 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 Safari crash.

AnalysisAI

Use-after-free in Safari's web content processing engine causes denial of service across Apple platforms, affecting Safari, iOS/iPadOS, and macOS prior to the 26.5.2 release line. The CVSS vector (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) confirms remote, unauthenticated triggering requiring only that a user visit attacker-controlled web content, with impact limited to availability - specifically an unexpected Safari crash. No active exploitation has been confirmed (not listed in CISA KEV), and no public exploit code has been identified at time of analysis.

Technical ContextAI

CWE-416 (Use After Free) describes a class of memory corruption flaw where heap-allocated memory is freed and then subsequently dereferenced, producing undefined behavior - most commonly a crash, but potentially exploitable for code execution in complex browser engine contexts. The affected surface is WebKit, Apple's proprietary browser rendering engine that underpins Safari on all platforms. Because iOS and iPadOS mandate WebKit for all browser rendering (including third-party browsers), the affected CPEs - cpe:2.3:a:apple:safari, cpe:2.3:a:apple:ios_and_ipados, and cpe:2.3:a:apple:macos - collectively represent all Safari users on Apple hardware. The vulnerability resides in the processing of 'maliciously crafted web content,' consistent with a parser, DOM, JavaScript engine, or media subsystem bug within WebKit's content pipeline.

RemediationAI

The primary fix is to apply the vendor-released patches: upgrade to Safari 26.5.2, iOS and iPadOS 26.5.2, or macOS Tahoe 26.5.2, as documented in Apple's security advisories at https://support.apple.com/en-us/127594 (macOS), https://support.apple.com/en-us/127595 (Safari), and https://support.apple.com/en-us/127685 (iOS/iPadOS). On iOS and iPadOS, update via Settings > General > Software Update; on macOS, use System Settings > General > Software Update; Safari on macOS updates alongside the OS or via App Store. As a compensating control prior to patching, organizations can restrict end-user access to untrusted or unknown web content through web filtering appliances or DNS-based blocking, reducing exposure to attacker-hosted pages - note this does not protect against compromised legitimate sites. Disabling JavaScript in Safari (Settings > Safari > Advanced > JavaScript) would reduce attack surface at the cost of broad site compatibility. There are no known workarounds that fully mitigate a WebKit use-after-free without patching.

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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-2026-43727 vulnerability details – vuln.today
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