EUVD-2026-40204
GHSA-mrq3-x9xw-5cqm
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Remote crafted web content (AV:N/AC:L/PR:N) requires the user to open the page (UI:R); memory corruption in the renderer yields high C/I/A within an unchanged scope (S:U).
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
A use-after-free issue was addressed with improved memory management. 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 memory corruption.
AnalysisAI
Memory corruption via use-after-free in Apple's WebKit browser engine allows remote attackers to corrupt memory when a victim processes maliciously crafted web content on Safari, iOS/iPadOS, or macOS prior to 26.5.2. The CVSS 3.1 score of 8.8 reflects network-reachable exploitation requiring only that a user open a malicious page; no public exploit is identified at time of analysis and the issue is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to process attacker-controlled web content - i.e., visit a malicious or compromised web page, or load attacker-supplied HTML inside an app's WebKit-based WebView - on an unpatched Safari/iOS/iPadOS/macOS build older than 26.5.2. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely consistent and point to a genuinely high-priority browser bug, though not yet an emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a malicious web page containing crafted HTML and JavaScript designed to trigger the WebKit use-after-free, then lures a victim into visiting it via phishing, a malicious ad, or a compromised site. When the victim's unpatched Safari or in-app WebView renders the content, the dangling pointer is reused, corrupting renderer memory and giving the attacker a foothold to attempt arbitrary code execution in the content process. … |
| Remediation | Vendor-released patch: update to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, which Apple states fix the issue via improved memory management; consult Apple's advisories at https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685 for exact build numbers per platform. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Conduct immediate inventory of all Safari, iOS, and iPadOS devices with versions prior to 26.5.2, including corporate systems and BYOD endpoints. …
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External POC / Exploit Code
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