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Apple Safari CVE-2026-43720

| EUVDEUVD-2026-40217 MEDIUM
Use After Free (CWE-416)
2026-06-29 apple GHSA-wvfc-f72q-gqc3
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-delivered web content requires active user visit (UI:R); crash is availability-only with no confidentiality or integrity impact 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 - 22:41 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 memory corruption in Safari's web content rendering engine causes a denial-of-service crash on Apple platforms running Safari, iOS/iPadOS, and macOS Tahoe prior to version 26.5.2. An attacker who can lure a victim to visit a maliciously crafted webpage can reliably crash the Safari browser, with no code execution or data exfiltration indicated by the available CVSS impact scores (C:N/I:N). No public exploit code and no CISA KEV listing have been identified at time of analysis, placing this in the category of a significant but non-critical browser crash vulnerability.

Technical ContextAI

CWE-416 (Use After Free) describes a class of memory safety flaw where a program continues to use a pointer to a heap-allocated object after that memory has been freed. In Safari's case, the flaw resides in the web content processing pipeline - almost certainly Apple's WebKit rendering engine, which underpins Safari on all Apple platforms and is mandated for all third-party browsers on iOS/iPadOS. Affected CPEs confirm the scope: cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*, cpe:2.3:a:apple:ios_and_ipados:*:*:*:*:*:*:*:*, and cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*. The use-after-free is triggered by processing specially crafted HTML, CSS, JavaScript, or media content; Apple's fix involved improved memory management to ensure object lifetimes are correctly tracked before dereferencing.

RemediationAI

Apply vendor-released patches immediately: update to Safari 26.5.2, iOS and iPadOS 26.5.2, or macOS Tahoe 26.5.2 as applicable. These updates are available through Apple Software Update and the App Store. Advisory references confirming the fix are https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. As a compensating control where immediate patching is not feasible, users can avoid browsing to untrusted or unknown websites in Safari and consider using Content Security Policy-enforcing browser extensions to block execution of arbitrary third-party scripts. Note that on iOS and iPadOS all browsers use WebKit and are equally affected regardless of browser brand; patch deployment via MDM is the only reliable enterprise mitigation on those platforms.

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Same weakness CWE-416 – Use After Free

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CVE-2013-2551 HIGH POC
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Same technique Denial Of Service

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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-2026-43720 vulnerability details – vuln.today
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