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Apple Safari EUVDEUVD-2026-40189

| CVE-2026-43734 MEDIUM
Use After Free (CWE-416)
2026-06-29 apple GHSA-44fm-8753-g4f8
Memory Corruption Apple Denial Of Service Use After Free 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 via webpage (AV:N), trivial delivery (AC:L), no privileges required (PR:N), user must visit page (UI:R), impact is process crash only with no confidentiality or integrity effect.

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 - 22:35 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 Safari's web content processing engine causes an unexpected process crash when rendering maliciously crafted web pages. Affected products include Safari, iOS and iPadOS, and macOS Tahoe, all prior to version 26.5.2. No public exploit code has been identified at time of analysis and this vulnerability is not listed in CISA KEV, though the low attack complexity and no-privileges-required vector make user-targeted delivery straightforward.

Technical ContextAI

CWE-416 (Use After Free) describes a memory safety flaw where a program continues to reference a memory region after it has been freed, enabling memory corruption. In this case, the flaw resides in Safari's web content processing pipeline - almost certainly within WebKit, Apple's shared browser rendering engine used across Safari, WKWebView on iOS/iPadOS, and macOS. The CPE data confirms three affected Apple product families: apple:safari, apple:ios_and_ipados, and apple:macos, reflecting WebKit's cross-platform presence. Apple's fix was delivered via improved memory management, a standard mitigation for UAF bugs. Because iOS and iPadOS mandate WebKit for all browser engines, the affected surface extends to third-party browsers on those platforms that use WKWebView.

RemediationAI

The primary fix is to update to the patched releases: Safari 26.5.2, iOS and iPadOS 26.5.2, or macOS Tahoe 26.5.2, available via Apple Software Update. Advisory references are https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. For iOS and iPadOS users, note that all browsers on those platforms rely on WebKit, so updating the OS is required - switching to an alternative browser does not provide a workaround. If immediate patching is not possible, a compensating control is to restrict access to untrusted web content using content filtering proxies or enterprise MDM web category blocking, though this introduces usability trade-offs. For macOS environments with strict patching cycles, disabling JavaScript or using a non-WebKit browser (Firefox, Chrome) for untrusted browsing can reduce exposure but does not address Safari itself.

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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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EUVD-2026-40189 vulnerability details – vuln.today
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