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Apple WebKit CVE-2026-28953

| EUVDEUVD-2026-29258 HIGH
Buffer Overflow (CWE-119)
2026-05-11 apple GHSA-53qj-jrj4-cjhh
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 - 14:26 vuln.today
CVSS changed
May 12, 2026 - 14:22 NVD
7.5 (HIGH)
Patch available
May 11, 2026 - 22:18 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

Information disclosure in Apple WebKit's web content processing engine allows remote attackers to read sensitive memory contents via maliciously crafted web pages. This buffer overflow vulnerability (CWE-119) affects all major Apple platforms including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS prior to their respective patched versions. The CVSS vector AV:N/AC:L/PR:N/UI:N indicates trivial network-based exploitation requiring no authentication or user interaction, though the impact is limited to confidentiality (C:H/I:N/A:N) rather than the process crash described by Apple. EPSS score of 0.03% (10th percentile) suggests low observed exploitation probability despite the ease of exploitation. No CISA KEV listing or public POC identified at time of analysis. Apple has released patches across all affected platforms.

Technical ContextAI

This vulnerability affects Apple's WebKit browser engine, the core rendering component used across all Apple operating systems for Safari and in-app web views. CWE-119 (Improper Restriction on Operations within Memory Buffer Bounds) represents a classic buffer overflow class where insufficient bounds checking allows memory access beyond allocated regions. Apple's description mentions 'improved memory handling' and 'unexpected process crash', suggesting the flaw occurs during parsing or rendering of web content when buffer size calculations fail. However, the CVSS vector (C:H/I:N/A:N) indicates high confidentiality impact with no availability impact, contradicting the 'process crash' description and suggesting the primary risk is information disclosure through out-of-bounds memory reads rather than denial of service. This discrepancy requires verification with Apple's security advisories. The CPE entries confirm impact across the entire Apple ecosystem: iOS/iPadOS (mobile), macOS (desktop), tvOS (streaming), visionOS (spatial computing), and watchOS (wearable).

RemediationAI

Apply vendor-released patches immediately through each platform's standard update mechanism: upgrade iOS and iPadOS to version 18.7.9 or 26.5, macOS Tahoe to 26.5, tvOS to 26.5, visionOS to 26.5, and watchOS to 26.5 as detailed in Apple security advisories HT127110, HT127111, HT127115, HT127118, HT127119, and HT127120 available at https://support.apple.com/en-us/127110 through https://support.apple.com/en-us/127120. For environments unable to patch immediately, implement network-layer content filtering to block access to untrusted websites and disable JavaScript in Safari/WebKit-based browsers, though this significantly degrades web functionality and user experience. Consider application allowlisting to restrict web content to trusted domains only, recognizing this may be impractical for general-purpose devices. Enterprise mobile device management (MDM) solutions should enforce automatic updates and restrict unapproved app installations that embed WebKit views. No viable workaround exists for the core vulnerability without disabling web browsing capability entirely.

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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-2026-28953 vulnerability details – vuln.today
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