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Apple Safari EUVDEUVD-2026-40214

| CVE-2026-39872 MEDIUM
Buffer Overflow (CWE-119)
2026-06-29 apple GHSA-3pf9-4p9r-8vcp
Apple Buffer Overflow Ios And Ipados
6.5
CVSS 3.1 · Vendor: apple
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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
vuln.today AI
6.5 MEDIUM

Network delivery via web content with mandatory user interaction; crash limited to browser process with no confidentiality or integrity impact and no scope change.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 29, 2026 - 22:41 vuln.today
CVSS changed
Jun 29, 2026 - 22:22 NVD
6.5 (MEDIUM)
Patch available
Jun 29, 2026 - 22:02 EUVD
CVE Published
Jun 29, 2026 - 19:43 cve.org
MEDIUM 6.5
CVE Published
Jun 29, 2026 - 19:43 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.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

Processing maliciously crafted web content in Apple Safari, iOS/iPadOS, and macOS Tahoe (all versions prior to 26.5.2) triggers an improper memory handling flaw (CWE-119 buffer overflow) in the web content processing pipeline, resulting in an unexpected process crash. The attack vector is network-based requiring user interaction (UI:R per CVSS), and impact is confined to availability - no confidentiality or integrity compromise is described. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious web page
Delivery
Victim clicks phishing link or visits compromised site
Exploit
WebKit parses crafted content
Execution
Buffer boundary violated in memory handler
Impact
Web content process crashes unexpectedly
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target user to actively load attacker-controlled web content - via a clicked link, redirect, or embedded iframe - making user interaction (UI:R) the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) scores 6.5 (Medium), accurately reflecting the constrained impact: the only confirmed effect is a process crash, with no data theft or code execution indicated by current disclosure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a web page or embeds malicious content (e.g., via a malicious advertisement or iframe) designed to trigger the WebKit memory handling flaw. A user on an unpatched Apple device clicks a phishing link or visits a compromised site, causing the browser's web content process to crash unexpectedly and rendering the browser unusable until restarted. …
Remediation Apply the vendor-released patches immediately: update to Safari 26.5.2, iOS 26.5.2 / iPadOS 26.5.2, and macOS Tahoe 26.5.2 via Apple Software Update (Settings > General > Software Update on iOS/iPadOS; System Settings > General > Software Update on macOS). … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-119 – Buffer Overflow

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EUVD-2026-40214 vulnerability details – vuln.today
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