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Apple Safari CVE-2026-43731

| EUVDEUVD-2026-40204 HIGH
Use After Free (CWE-416)
2026-06-29 apple GHSA-mrq3-x9xw-5cqm
Buffer Overflow Use After Free Memory Corruption Apple Ios And Ipados
8.8
CVSS 3.1 · Vendor: apple
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Severity by source

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

Remote crafted web content (AV:N/AC:L/PR:N) requires the user to open the page (UI:R); memory corruption in the renderer yields high C/I/A within an unchanged scope (S:U).

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

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

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

Lifecycle Timeline

5
Analysis Generated
Jun 29, 2026 - 22:32 vuln.today
CVSS changed
Jun 29, 2026 - 22:22 NVD
8.8 (HIGH)
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
HIGH 8.8

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 memory corruption.

AnalysisAI

Memory corruption via use-after-free in Apple's WebKit browser engine allows remote attackers to corrupt memory when a victim processes maliciously crafted web content on Safari, iOS/iPadOS, or macOS prior to 26.5.2. The CVSS 3.1 score of 8.8 reflects network-reachable exploitation requiring only that a user open a malicious page; no public exploit is identified at time of analysis and the issue is not listed in CISA KEV. Successful exploitation typically serves as the initial stage of a browser-based attack chain (often paired with a sandbox escape) to achieve code execution in the renderer.

Technical ContextAI

The flaw is a CWE-416 use-after-free in the web content rendering stack shared across Apple platforms - Safari's WebKit engine, which also backs the system WebView on iOS and iPadOS and underpins web content processing on macOS. A use-after-free occurs when memory is freed but a dangling pointer continues to reference it; subsequent reuse of that memory allows an attacker who controls heap layout (via crafted HTML/JavaScript/DOM manipulation) to coerce the engine into operating on attacker-influenced data, leading to memory corruption. The CPE data (cpe:2.3:a:apple:safari, apple:ios_and_ipados, apple:macos) confirms the same underlying WebKit defect spans all three product lines, which is why Apple shipped coordinated 26.5.2 fixes. Apple states the issue was addressed with improved memory management.

RemediationAI

Vendor-released patch: update to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, which Apple states fix the issue via improved memory management; consult Apple's advisories at https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685 for exact build numbers per platform. Because exploitation requires processing malicious web content, interim compromising controls include disabling JavaScript for untrusted sites (which breaks most modern web applications), enabling Lockdown Mode on iOS/iPadOS/macOS for high-risk users (which restricts web technologies and some media handling at the cost of reduced functionality), and using web/DNS filtering or enterprise MDM web-content restrictions to limit exposure to untrusted sites. These workarounds reduce but do not eliminate risk and degrade usability, so prompt installation of 26.5.2 is the only complete remediation.

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Same weakness CWE-416 – Use After Free

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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-2026-43731 vulnerability details – vuln.today
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