Apple Safari EUVD-2026-40214

| CVE-2026-39872 MEDIUM

Buffer Overflow (CWE-119)

2026-06-29 apple

GHSA-3pf9-4p9r-8vcp

Buffer Overflow Apple Ios And Ipados

6.5

CVSS 3.1 · Vendor: apple

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

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

Vulnerability Assessment

Weakness	CWE CWE-119 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	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. No authentication or special configuration is required per CVSS (PR:N, AC:L); the vulnerability is present in default installations of all affected products prior to version 26.5.2. On iOS and iPadOS, the mandatory use of WebKit across all browser apps means exposure is not limited to Safari users - any browser app or WebView-based app that loads external web content is potentially exposed. Exploitation is bounded to causing a process crash (availability impact); no conditions enabling confidentiality or integrity compromise are confirmed in available data. Exploitation is not limited to any specific operating mode or opt-in feature - standard web browsing is the attack surface.
Impact	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. The attack complexity is low and no privileges are required, but the mandatory user interaction (UI:R) is a meaningful limiting factor. No EPSS data was provided, so exploitation probability cannot be quantified numerically. The vulnerability is absent from the CISA KEV catalog, and no public exploit code has been identified at time of analysis. Real-world priority should be assessed against patch deployment feasibility: given WebKit's ubiquitous footprint on Apple platforms and Apple's history of CWE-119 flaws escalating to full RCE chains, this warrants prompt patching even though current disclosure is limited to a DoS. The absence of C/I impact should be verified against the full advisory - Apple's descriptions are intentionally terse and buffer overflows in browser engines have historically enabled more severe exploitation than initial disclosure suggests.
Exploit ScenarioDerived	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. No public exploit code has been identified at time of analysis, and the attack currently appears limited to a denial-of-service outcome.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 29, 2026

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. No public exploit code has been identified at time of analysis, and this vulnerability does not appear in the CISA KEV catalog.

RemediationAI

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 update instructions are available at https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. For managed enterprise fleets, use Mobile Device Management (MDM) - such as Jamf or Apple Business Manager - to push the update to all enrolled iOS/iPadOS and macOS devices. As an interim compensating control, restricting end-user browsing to approved domains via web content filtering (e.g., DNS-layer filtering) reduces exposure, but this is impractical for general-purpose devices and does not eliminate risk from compromised trusted domains or malicious ads. Disabling JavaScript would prevent most web content exploitation paths but would break the majority of modern web functionality and is not a viable long-term control.

Affected VersionsENISA

iOS and iPadOS 0 <26.5.2

macOS 0 <26.5.2

Safari 0 <26.5.2

Affected Packages

euvd ios_and_ipados fix: 26.5.2

euvd macos fix: 26.5.2

euvd safari fix: 26.5.2

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in euvd

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Technical ContextAI · show details

The vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), consistent with a buffer overflow or out-of-bounds memory access condition. Given Apple's advisory language of 'improved memory handling' and the web content processing trigger, the flaw almost certainly resides within WebKit, Apple's open-source browser rendering engine. WebKit is shared across all three affected platforms: Safari (cpe:2.3:a:apple:safari:*), iOS and iPadOS (cpe:2.3:a:apple:ios_and_ipados:*), and macOS Tahoe (cpe:2.3:a:apple:macos:*). Critically, iOS and iPadOS mandate WebKit as the browser engine for all apps - meaning every third-party browser on those platforms (Chrome, Firefox, Edge) shares the same vulnerable engine and extends the attack surface beyond Safari alone. The scope is unchanged (S:U), indicating the crash is contained within the sandboxed web content process.

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Exploit and PoC references, threat intelligence from 22 sources

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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

SUSE HIGH

Red Hat 6.5 MEDIUM

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

4

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.

Threat Intelligence Overview

EPSS Score

0.2%

Top 91% exploitable

Prevalence

Ubiquitous

Safari and WebKit ship on all Apple devices worldwide

Social Media

1

Sightings

Data Quality

7 sources

Confidence: High

EUVD

CVE.org

EPSS

Vulnrichment Vendor CIRCL

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

No

Human Impact· derived

High

Technical Impact

Partial

Priority Score

32

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2009-0927 HIGH POC

CVE-2012-1889 HIGH POC

Vendor StatusVendor

SUSE

Severity: Important

Product	Status
SUSE Liberty Linux 8	Fixed
SUSE Liberty Linux 9	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS	Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS	Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS	Affected

References

Advisories & patches

ADVISORY https://access.redhat.com/errata/RHSA-2026:42062 ADVISORY https://access.redhat.com/errata/RHSA-2026:42088 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-39872 ADVISORY https://vuldb.com/vuln/374716 REF https://support.apple.com/en-us/127594 REF https://support.apple.com/en-us/127595 REF https://support.apple.com/en-us/127685 REF https://support.apple.com/en-us/128068 REF https://support.apple.com/en-us/128069 REF https://support.apple.com/en-us/128070 REF https://support.apple.com/en-us/148287

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