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Apple Safari CVE-2026-43745

| EUVDEUVD-2026-40199 MEDIUM
Out-of-bounds Write (CWE-787)
2026-06-29 apple GHSA-jwf6-8r5m-99c4
Buffer Overflow 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 delivery with no privileges needed, but UI:R is correct since victim must visit the page; crash-only outcome sets C:N/I:N and A:H with unchanged scope.

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 - 22:37 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

An out-of-bounds write issue was addressed with improved input validation. 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

Safari's web content processing engine on iOS, iPadOS, and macOS Tahoe contains an out-of-bounds write (CWE-787) that causes an unexpected crash when rendering maliciously crafted web content. All Safari versions prior to 26.5.2 - and the underlying WebKit engine shipping with iOS/iPadOS and macOS Tahoe prior to 26.5.2 - are affected. Apple has released patched versions across all three platforms; no public exploit code or CISA KEV listing has been identified at time of analysis, and available impact is limited to a denial-of-service crash with no confirmed code execution path.

Technical ContextAI

CWE-787 (Out-of-Bounds Write) describes a class of memory-safety flaw where a write operation targets a memory address outside the allocated buffer's boundaries, leading to heap or stack corruption. In Safari's context, this vulnerability resides in the web content processing pipeline - most likely WebKit, Apple's open-source browser engine used across all Apple platforms. Crafted HTML, JavaScript, CSS, or media content can trigger the bounds violation during parsing or rendering. CPE strings (cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*, cpe:2.3:a:apple:ios_and_ipados:*:*:*:*:*:*:*:*, cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*) confirm the flaw spans Safari as a standalone application on macOS and as the mandatory browser engine embedded in iOS and iPadOS. Apple's advisory credits improved input validation as the fix mechanism, consistent with a parser-level bounds check being absent or insufficient in the affected code path.

RemediationAI

Update to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, or macOS Tahoe 26.5.2, all of which Apple has released to address this vulnerability. Updates are available through Apple Software Update on macOS and via Settings > General > Software Update on iOS and iPadOS. Full advisory details are 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). As a compensating control prior to patching, users can restrict browsing to known-trusted sites and avoid following unsolicited links - this materially reduces exposure but limits browser utility and is not a substitute for patching. On iOS and iPadOS, Safari cannot be replaced as the underlying WebKit engine, making the OS-level update the only structural fix for that platform.

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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-2026-43745 vulnerability details – vuln.today
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