EUVD-2026-40199
GHSA-jwf6-8r5m-99c4
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Network delivery with no privileges needed, but UI:R is correct since victim must visit the page; crash-only outcome sets C:N/I:N and A:H with unchanged scope.
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
An out-of-bounds write issue was addressed with improved input validation. 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 Safari crash.
AnalysisAI
Safari's web content processing engine on iOS, iPadOS, and macOS Tahoe contains an out-of-bounds write (CWE-787) that causes an unexpected crash when rendering maliciously crafted web content. All Safari versions prior to 26.5.2 - and the underlying WebKit engine shipping with iOS/iPadOS and macOS Tahoe prior to 26.5.2 - are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a victim to actively navigate to an attacker-controlled URL using an unpatched version of Safari on iOS, iPadOS, or macOS Tahoe prior to 26.5.2. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.5 (Medium) with vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H correctly reflects network reachability with no authentication or complexity barriers, but requires active user interaction (UI:R) and produces only an availability impact - a Safari crash rather than code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a webpage containing specially structured content - such as malformed JavaScript objects, crafted media, or malicious HTML - designed to trigger an out-of-bounds write in Safari's web content processing pipeline. A victim on an unpatched Apple device is sent or lured to the URL, and upon loading the page in Safari, the browser crashes due to memory corruption in the rendering engine. … |
| Remediation | Update to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, or macOS Tahoe 26.5.2, all of which Apple has released to address this vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-787 – Out-of-bounds Write
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External POC / Exploit Code
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