EUVD-2026-40200
GHSA-ch2x-vqw2-2h28
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Network delivery via web content, no authentication, low complexity, but mandatory user interaction; impact confirmed as availability-only (process crash, no data leakage confirmed).
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionCVE.org
The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected process crash.
AnalysisAI
Out-of-bounds read in Apple's web content processing engine (WebKit) causes a browser process crash when a user visits a maliciously crafted webpage, affecting Safari, iOS/iPadOS, and macOS Tahoe. All versions prior to the 26.5.2 releases across those platforms are affected, making this a broad-surface denial-of-service vulnerability against Apple's default browser ecosystem. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim actively visit or open maliciously crafted web content using an unpatched version of Safari, iOS, iPadOS, or macOS Tahoe - user interaction is mandatory (UI:R in CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 Medium score is consistent with a network-delivered, user-interaction-required denial-of-service: AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a webpage containing specially crafted web content - such as a malformed HTML structure, JavaScript heap manipulation, or media payload - designed to trigger the out-of-bounds read in WebKit's memory handling routines. When a victim on an unpatched Apple device visits the URL via Safari, the rendering process reads beyond a valid memory boundary, triggering an unexpected crash and browser process termination. … |
| Remediation | Vendor-released patch: Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2 - all released by Apple and documented at https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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