CVE-2026-43776

Analyzed Analyzed - Analysis Complete

Buffer Overflow in iOS and macOS with Arbitrary Code Execution

Publication date: 2026-07-27

Last updated on: 2026-07-28

Assigner: Apple Inc.

Description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6. Processing a maliciously crafted file may lead to unexpected app termination or arbitrary code execution.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-27

Last Modified

2026-07-28

Generated

2026-08-17

AI Q&A

2026-07-28

EPSS Evaluated

2026-08-15

NVD

CVE-2026-43776

EUVD

EUVD-2026-49446

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos	From 15.0 (inc) to 15.7.8 (exc)
apple	macos	From 26.0 (inc) to 26.6 (exc)
apple	ipados	to 26.6 (exc)
apple	iphone_os	to 26.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-120	The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is a buffer overflow issue caused by insufficient bounds checking. It allows processing a maliciously crafted file to trigger unexpected app termination or arbitrary code execution. It affects multiple Apple operating systems including iOS, iPadOS, and macOS versions.

Detection Guidance

This vulnerability is fixed in specific software versions (iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6). Detection involves checking installed software versions against these updates. Use system update commands like 'softwareupdate --list' on macOS or 'Settings > General > Software Update' on iOS/iPadOS to verify if updates are applied.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code on your device, potentially leading to data theft, system compromise, or denial of service. Users should update to the patched versions to mitigate risks.

Compliance Impact

The vulnerability involves a buffer overflow that could allow arbitrary code execution or app termination when processing maliciously crafted files. This could potentially lead to unauthorized data access or manipulation, which may impact compliance with standards like GDPR (data protection) or HIPAA (health information privacy) if exploited.

Mitigation Strategies

Update affected systems to the latest patched versions: iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, or macOS Tahoe 26.6. Avoid processing untrusted files until updates are applied.

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