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WebKit CVE-2026-28904

| EUVDEUVD-2026-29229 HIGH
Buffer Overflow (CWE-119)
2026-05-11 apple GHSA-x38g-jvpg-6w2f
Apple Buffer Overflow Ios And Ipados Tvos Visionos Watchos
7.5
CVSS 3.1 · Vendor: apple
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Severity by source

Vendor (apple) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

5
Analysis Generated
May 12, 2026 - 14:23 vuln.today
CVSS changed
May 12, 2026 - 14:22 NVD
7.5 (HIGH)
Patch available
May 11, 2026 - 22:03 EUVD
CVE Published
May 11, 2026 - 20:07 nvd
UNKNOWN (no severity yet)
CVE Published
May 11, 2026 - 20:07 nvd
HIGH 7.5

DescriptionCVE.org

The issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may lead to an unexpected process crash.

AnalysisAI

Memory corruption in WebKit across Apple's ecosystem enables confidentiality breach via malicious web content without user interaction. Affects iOS/iPadOS versions prior to 18.7.9 and 26.5, macOS Tahoe prior to 26.5, and all Apple operating systems (tvOS, visionOS, watchOS) prior to 26.5. Despite CVSS 7.5 (High), the EPSS score of 0.03% (10th percentile) indicates minimal real-world exploitation likelihood at time of analysis. No active exploitation confirmed (not in CISA KEV), and no public exploit code identified. Apple has released patches across all affected platforms.

Technical ContextAI

This vulnerability stems from a buffer overflow (CWE-119) in WebKit, Apple's browser engine used across iOS, macOS, tvOS, visionOS, and watchOS. Buffer overflows occur when memory write operations exceed allocated buffer boundaries, potentially corrupting adjacent memory regions. The description indicates improved memory handling addressed the flaw, suggesting the original implementation lacked proper bounds checking during web content parsing or rendering. WebKit processes HTML, CSS, JavaScript, and media content, making it a critical attack surface for web-based exploits. The CPE strings identify this as affecting Apple's core operating system components rather than standalone applications, indicating the vulnerability exists in system-level WebKit frameworks shared across Safari and in-app web views.

RemediationAI

Update to patched versions immediately: iOS and iPadOS 18.7.9 or 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5. Apple's security updates are available through standard system update mechanisms (Settings > General > Software Update on iOS/iPadOS, System Settings > General > Software Update on macOS). Full advisory details are available at https://support.apple.com/en-us/127110, https://support.apple.com/en-us/127111, https://support.apple.com/en-us/127115, https://support.apple.com/en-us/127118, https://support.apple.com/en-us/127119, and https://support.apple.com/en-us/127120. If immediate patching is not feasible, organizations can implement network-level content filtering to block access to untrusted websites, though this significantly impacts user functionality and does not protect against malicious content in trusted contexts like email HTML rendering or in-app web views. Safari's Lockdown Mode (available on iOS 16+, macOS Ventura+) provides additional hardening by disabling JIT compilation and other attack surfaces, but severely restricts web functionality and is only practical for high-risk users. No effective workaround exists that maintains normal web browsing capability.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Development Tools 15 SP7 Fixed

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CVE-2026-28904 vulnerability details – vuln.today
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