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Apple iOS EUVDEUVD-2026-49502

| CVE-2026-43816 MEDIUM
Out-of-bounds Write (CWE-787)
2026-07-27 apple GHSA-pw2w-cc2c-542x
5.5
CVSS 3.1 · Vendor: apple
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Attack ChainAIDerived

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

  1. Access
    User downloads malicious app
  2. Delivery
    User runs the app
  3. Exploit
    App exploits out-of-bounds write
  4. Execution
    Kernel memory corruption
  5. Impact
    System terminates unexpectedly

Vulnerability Assessment

Weakness
CWE
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.

Exploitation Conditions

The attacker must have the ability to run a crafted application on the target device (user interaction required). The vulnerability is triggered when the app processes data without proper bounds checking. No special configuration or elevated privileges are needed beyond running the app, but local access is mandatory.

Impact

CVSS 3.1 base score 5.5 (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) indicates a local attack with low complexity, requiring user interaction, and only impacting availability (no confidentiality or integrity loss). EPSS probability is low (0.16%, percentile 6%). CISA's SSVC framework reports no active exploitation, not automatable, and partial technical impact. These signals collectively suggest a limited real-world risk; the vulnerability is not currently targeted by attackers and the high CVSS is tempered by the local user interaction requirement and absence of data compromise.

Exploit ScenarioDerived

An attacker distributes a malicious app via the App Store or through side-loading. When a user runs the app, it triggers an out-of-bounds write by crafting input data, leading to a kernel panic and immediate system termination. As no public exploit code is identified, this scenario currently remains theoretical.

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 – Jul 28, 2026

An out-of-bounds write vulnerability in Apple iOS 26.6 and earlier allows a malicious app to cause unexpected system termination (kernel panic). No public exploit or active exploitation has been reported; patch available from Apple.

RemediationAI

Apple has released patched versions to fix this issue. Update to iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6 via the vendor's software update mechanism. No workarounds are available; the only complete remediation is applying the patches from the advisory links provided.

Affected VersionsENISA

watchOS 0 <26.6
iOS and iPadOS 0 <26.6
tvOS 0 <26.6
visionOS 0 <26.6
macOS 0 <26.6

Affected Packages

euvd ios_and_ipados fix: 26.6
euvd macos fix: 26.6
euvd tvos fix: 26.6
euvd visionos fix: 26.6
euvd watchos fix: 26.6

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 5 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability is an out-of-bounds write (CWE-787) occurring in the memory management of Apple's operating systems. This class of flaw typically arises when an application writes data beyond the allocated buffer boundary, potentially corrupting adjacent memory and leading to a crash. The CPE data confirms affectation across Apple's software ecosystem: iOS and iPadOS, macOS Tahoe, tvOS, visionOS, and watchOS, all versions prior to 26.6.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (apple) PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI 5.5 MEDIUM

Local access, user interaction, only availability impact.

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

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

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

Lifecycle Timeline

3
Patch available
Jul 27, 2026 - 21:17 EUVD
CVE Published
Jul 27, 2026 - 20:13 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 27, 2026 - 20:13 cve.org
MEDIUM 5.5

DescriptionCVE.org

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. An app may be able to cause unexpected system termination.

Threat Intelligence Overview

EPSS Score
0.2%
Top 94% exploitable
Prevalence
High
Widely deployed mobile and desktop OS
Data Quality
5 sources
Confidence: Medium

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
Small
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

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.

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

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