EUVD-2026-40207
GHSA-q973-f466-5gv5
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Web content delivery is network-based (AV:N), no privileges needed (PR:N), but user must load the page (UI:R); impact is crash only, so C:N/I:N and A:H.
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
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 an unexpected Safari crash.
AnalysisAI
Use-after-free memory corruption in Safari's web content processing causes an unexpected application crash across Apple platforms. Affected are Safari, iOS, iPadOS, and macOS Tahoe prior to version 26.5.2; exploitation requires only that a user visits or loads maliciously crafted web content, making drive-by delivery via a malicious webpage the primary vector. Impact is confined to availability - a forced Safari crash (denial of service) - with no confirmed confidentiality or integrity consequences. No public exploit code or active exploitation has been identified at time of analysis.
Technical ContextAI
CWE-416 (Use After Free) describes a class of memory safety bug where a program continues to reference memory after it has been freed, leading to undefined behavior - typically a crash, but potentially exploitable for code execution depending on heap layout control. The vulnerability resides in Safari's web content processing engine (WebKit, Apple's browser engine), triggered during parsing or rendering of attacker-controlled content. Affected CPE strings confirm coverage across three product lines: cpe:2.3:a:apple:safari, cpe:2.3:a:apple:ios_and_ipados, and cpe:2.3:a:apple:macos, indicating the flaw is present in the shared WebKit component that underpins browsing on all Apple platforms. Apple's fix description - 'improved memory management' - is consistent with patching UAF via object lifetime corrections or deferred deallocation guards.
RemediationAI
Vendor-released patch: Safari 26.5.2, iOS and iPadOS 26.5.2, and macOS Tahoe 26.5.2. Users should update via System Settings > General > Software Update on macOS, or Settings > General > Software Update on iOS/iPadOS. Safari on macOS can also be updated independently through the Mac App Store. Apple security advisory references are https://support.apple.com/en-us/127594 (Safari), https://support.apple.com/en-us/127595 (iOS/iPadOS), and https://support.apple.com/en-us/127685 (macOS). Where immediate patching is not feasible, restricting user access to untrusted web content - such as enforcing browser content filtering policies or disabling JavaScript on untrusted sites via content blockers - can reduce exposure, though these controls are imperfect and carry usability trade-offs. On managed iOS/iPadOS fleets, Mobile Device Management (MDM) policies restricting browsing to allowlisted URLs can serve as a compensating control pending patch deployment.
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today