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Apple WebKit CVE-2026-28903

| EUVDEUVD-2026-29228 MEDIUM
Buffer Overflow (CWE-119)
2026-05-11 apple GHSA-wmw9-gq3p-8c96
Buffer Overflow Apple Tvos Visionos Watchos 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
SUSE
MEDIUM
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
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 08, 2026 - 12:48 vuln.today
CVSS changed
May 13, 2026 - 16:22 NVD
6.5 (MEDIUM)
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
MEDIUM 6.5

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 Apple's WebKit web content processing engine causes an unexpected process crash (denial-of-service) across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS when a victim processes attacker-controlled web content. The CVSS vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H confirms network-reachable, unauthenticated exploitation limited to availability impact within the affected process - no code execution or data exfiltration is indicated. No public exploit code has been identified at time of analysis, and EPSS scoring at 0.03% (10th percentile) combined with SSVC Exploitation status of 'none' signal low current exploitation pressure.

Technical ContextAI

The root cause is CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a class encompassing buffer overflows and out-of-bounds memory access. Apple's intelligence tag confirms this as a 'Buffer Overflow' variant, addressed via improved memory handling - consistent with bounds-checking enforcement in a parser or renderer. The affected component is Apple's WebKit engine, the shared browser rendering stack present across all Apple platforms and used by Safari, all iOS/iPadOS third-party browsers (mandated by App Store policy), and any app embedding WKWebView. CPE data confirms cross-platform scope: cpe:2.3:a:apple:ios_and_ipados, cpe:2.3:a:apple:macos, cpe:2.3:a:apple:tvos, cpe:2.3:a:apple:visionos, and cpe:2.3:a:apple:watchos are all listed as affected, reflecting WebKit's universal deployment across the Apple ecosystem. The unchanged scope (S:U) indicates the memory corruption is contained to the WebKit/browser process and does not achieve OS-level privilege escalation.

RemediationAI

Vendor-released patches are available for all affected platforms. Update to iOS 18.7.9 or iPadOS 18.7.9 (legacy device track), iOS 26.5 or iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, or watchOS 26.5 via Settings > General > Software Update (iOS/iPadOS/watchOS/visionOS) or System Settings > General > Software Update (macOS). Enterprise MDM administrators should push these updates via Apple Business Manager or Jamf. Apple's platform-specific advisories are at https://support.apple.com/en-us/127110 (iOS/iPadOS 18.7.9), https://support.apple.com/en-us/127111 (iOS/iPadOS 26.5), https://support.apple.com/en-us/127118, https://support.apple.com/en-us/127119, https://support.apple.com/en-us/127120, and https://support.apple.com/en-us/127121. If immediate patching is not feasible, deploying web content filtering via MDM (Supervised Web Content Filter or a proxy) to block access to untrusted external URLs reduces exposure, at the cost of general browsing capability. Disabling JavaScript in Safari (Settings > Safari > Advanced) reduces WebKit parser attack surface but causes widespread site incompatibility and is not practical for general users.

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Same weakness CWE-119 – Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Medium
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-2026-28903 vulnerability details – vuln.today
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