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Safari WebKit CVE-2026-43658

| EUVDEUVD-2026-29303 HIGH
Buffer Overflow (CWE-119)
2026-05-11 apple GHSA-gc3p-ph3x-xqq6
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 - 18:25 vuln.today
CVSS changed
May 12, 2026 - 18:22 NVD
7.5 (HIGH)
Patch available
May 11, 2026 - 22:18 EUVD
CVE Published
May 11, 2026 - 20:08 nvd
UNKNOWN (no severity yet)
CVE Published
May 11, 2026 - 20:08 nvd
HIGH 7.5

DescriptionCVE.org

The issue was addressed with improved memory handling. This issue is fixed in 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 Safari crash.

AnalysisAI

Memory corruption in Safari's WebKit engine across all Apple platforms allows remote attackers to trigger information disclosure via maliciously crafted web content delivered through network-accessible attack vectors requiring no authentication or user interaction. Despite the vendor description focusing on crash scenarios, the CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) indicates high confidentiality impact with no availability impact, suggesting potential memory disclosure rather than denial of service. Patched in iOS/iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5. EPSS score of 0.02% (5th percentile) suggests low probability of mass exploitation despite network-accessible attack vector.

Technical ContextAI

This vulnerability affects WebKit, Apple's browser engine used across all Apple platforms for rendering web content in Safari and other applications. The root cause is CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), commonly known as buffer overflow. The affected component processes web content including HTML, CSS, JavaScript, and multimedia resources. The discrepancy between the vendor's description (Safari crash/availability) and the CVSS vector (high confidentiality impact, no availability impact) suggests the underlying memory handling flaw may expose sensitive memory contents during web content processing, with crashes potentially being a secondary symptom. All Apple operating systems share the same WebKit codebase, explaining the simultaneous patching across iOS/iPadOS, macOS, tvOS, visionOS, and watchOS platforms.

RemediationAI

Apply vendor-released patches by updating to iOS/iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, or watchOS 26.5 as appropriate for each device type. Detailed security update documentation available at https://support.apple.com/en-us/127110 (iOS/iPadOS), https://support.apple.com/en-us/127115 (macOS), https://support.apple.com/en-us/127118 (tvOS), https://support.apple.com/en-us/127119 (visionOS), and https://support.apple.com/en-us/127120 (watchOS). For environments unable to immediately patch, implement network-level content filtering to block access to untrusted websites, though this significantly degrades user experience and may not be feasible for general-purpose devices. Alternatively, disable JavaScript in Safari (Settings > Safari > Advanced > JavaScript) to reduce attack surface, but this breaks most modern web applications and is only viable for limited-use devices. Enterprise environments can restrict web browsing to approved domains via MDM profiles (com.apple.webcontent-filter payload), trading functionality for temporary risk reduction until patching is complete.

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Same weakness CWE-119 – Buffer Overflow

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8.8
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Same technique Buffer Overflow

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9.8
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CVE-2009-0927 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2010-3333 HIGH POC
7.8

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-2026-43658 vulnerability details – vuln.today
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