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Apple WebKit EUVDEUVD-2026-29228

| CVE-2026-28903 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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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Attacker crafts malicious web page with memory-corrupting content
  2. Delivery
    Attacker distributes URL via phishing or malvertising
  3. Exploit
    Victim on unpatched Apple device opens URL
  4. Execution
    WebKit parses crafted content, triggering CWE-119 buffer overflow
  5. Impact
    Browser or web view process crashes (denial of service)

Vulnerability Assessment

Weakness
CWE
CWE-119
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, buffer size validation
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

The victim must actively navigate to or load attacker-controlled web content on an unpatched Apple device - for example, opening a malicious URL in Safari, a third-party iOS browser (all of which use WebKit on iOS/iPadOS), or any application embedding WKWebView. CVSS UI:R confirms that passive or drive-by exploitation without user interaction is not possible; the victim must initiate the content load. Exploitation is further constrained to denial-of-service only (process crash) with no code execution, privilege escalation, or data access achievable based on C:N/I:N/A:H and unchanged scope (S:U). SSVC Automatable:no indicates the attack cannot be reliably mass-delivered via autonomous scanning or bot-driven campaigns. Devices updated to iOS 18.7.9 or iPadOS 18.7.9, iOS/iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, or watchOS 26.5 are not affected.
Impact

The CVSS 6.5 Medium score reflects a genuine but contained risk: network-reachable and low-complexity, but requiring user interaction (UI:R) and producing only availability impact (A:H, C:N, I:N). The high availability rating corresponds to a reliable process crash, not a service-wide outage or persistent compromise. EPSS at 0.03% (10th percentile) and SSVC ratings of Exploitation:none and Automatable:no substantially reduce operational urgency - this is not anticipated to be mass-exploited via automated delivery. SSVC Technical Impact of 'partial' aligns with crash-only outcome. The CVSS vector and SSVC are consistent and non-conflicting. One anomaly worth noting: Red Hat and SUSE appear in the intelligence tags despite no Linux platform being present in the CPE data; this likely reflects downstream vulnerability-tracking metadata rather than actual cross-platform exposure, but defenders should verify no shared WebKit dependency exists in their Linux environments. Overall, this is a routine patching priority for Apple device fleets - not a critical incident requiring emergency response.
Exploit ScenarioDerived

An attacker crafts a malicious webpage embedding content specifically designed to trigger an out-of-bounds memory access in WebKit's parser or renderer. The attacker distributes the URL via phishing email, SMS, or malvertising targeting Apple device users on unpatched OS versions. When the victim taps or clicks the link and WebKit begins processing the page, the memory corruption triggers an unexpected crash of the Safari or embedded web view process, disrupting the user's session - no attacker persistence or code execution is achieved given the S:U/C:N/I:N impact profile. No public exploit code has been identified at time of analysis.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 08, 2026

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.

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.

Affected VersionsENISA

macOS 0 <26.5
iOS and iPadOS 0 <26.5
iOS and iPadOS 0 <18.7.9
tvOS 0 <26.5
visionOS 0 <26.5
watchOS 0 <26.5

Affected Packages

euvd ios_and_ipados fix: 18.7.9, 26.5
euvd macos fix: 26.5
euvd tvos fix: 26.5
euvd visionos fix: 26.5
euvd watchos fix: 26.5

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 5 packages in euvd

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Technical ContextAI · show details

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.

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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
Red Hat 8.8 HIGH

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

4
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.

Threat Intelligence Overview

EPSS Score
0.0%
Top 90% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2023-4966 HIGH POC
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Same technique 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

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-28903 ADVISORY https://vuldb.com/vuln/362807 REF https://access.redhat.com/errata/RHSA-2026:25918 REF https://access.redhat.com/errata/RHSA-2026:25927 REF https://access.redhat.com/errata/RHSA-2026:27728 REF https://access.redhat.com/errata/RHSA-2026:27785 REF https://access.redhat.com/errata/RHSA-2026:27804 REF https://access.redhat.com/errata/RHSA-2026:28114 REF https://access.redhat.com/errata/RHSA-2026:28146 REF https://access.redhat.com/errata/RHSA-2026:28147 REF https://access.redhat.com/errata/RHSA-2026:28148 REF https://access.redhat.com/security/cve/CVE-2026-28903 REF https://bugzilla.redhat.com/show_bug.cgi?id=2483959 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28903.json REF https://support.apple.com/en-us/127110 REF https://support.apple.com/en-us/127111 REF https://support.apple.com/en-us/127115 REF https://support.apple.com/en-us/127118 REF https://support.apple.com/en-us/127119 REF https://support.apple.com/en-us/127120 REF https://support.apple.com/en-us/127121

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