CVE-2026-64771

Analyzed Analyzed - Analysis Complete

Buffer Overflow in iOS and macOS Systems

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, tvOS 26.6, visionOS 26.6. A remote attacker may be able to cause unexpected application termination or heap corruption.

CVSS Scores

EPSS Scores

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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

2026-08-16

NVD

CVE-2026-64771

EUVD

EUVD-2026-49554

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)
apple	tvos	to 26.6 (exc)
apple	visionos	to 26.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This is a buffer overflow vulnerability caused by insufficient bounds checking. It allows a remote attacker to write data beyond the intended memory area, potentially corrupting heap memory or causing applications to crash.

Detection Guidance

This vulnerability is specific to Apple operating systems and requires checking the installed versions of iOS, iPadOS, macOS, tvOS, or visionOS. No direct commands can detect the buffer overflow itself, but you can verify if your system is patched by checking the OS version against the fixed releases.

Impact Analysis

An attacker could exploit this to crash applications on affected devices or corrupt memory, leading to data loss or unexpected behavior. It may also enable further malicious actions if combined with other vulnerabilities.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. The vulnerability involves a buffer overflow that could lead to application termination or heap corruption, which may indirectly affect data integrity or availability. However, no explicit compliance implications are mentioned.

Mitigation Strategies

Update affected Apple devices to the latest versions: iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6, tvOS 26.6, or visionOS 26.6 to address the buffer overflow issue.

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