CVE-2026-28931

Analyzed Analyzed - Analysis Complete

Buffer Overflow in iOS and macOS via Malicious NFS Server

Publication date: 2026-07-27

Last updated on: 2026-07-29

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 Tahoe 26.6, tvOS 26.6, watchOS 26.6. Connecting to a malicious NFS server may lead to kernel memory corruption.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-27

Last Modified

2026-07-29

Generated

2026-08-17

AI Q&A

2026-07-28

EPSS Evaluated

2026-08-15

NVD

CVE-2026-28931

EUVD

EUVD-2026-49422

Affected Vendors & Products

Vendor	Product	Version / Range
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	watchos	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 is a buffer overflow vulnerability caused by insufficient bounds checking. It allows a malicious NFS server to corrupt kernel memory when a vulnerable device connects to it. The issue was fixed in specific versions of iOS, iPadOS, macOS, tvOS, and watchOS.

Detection Guidance

This vulnerability involves a buffer overflow in kernel memory when connecting to a malicious NFS server. Detection requires checking system and kernel logs for unusual activity after NFS connections, particularly examining memory corruption indicators or crashes in kernel processes. No specific commands are provided in the context.

Impact Analysis

If you connect to a malicious NFS server, an attacker could exploit this flaw to corrupt kernel memory on your device. This may lead to system crashes, data corruption, or unauthorized code execution with elevated privileges.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a buffer overflow in Apple operating systems that could lead to kernel memory corruption when connecting to a malicious NFS server. Without explicit details on data exposure or privacy implications, its compliance impact remains unclear.

Mitigation Strategies

Update your devices to iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, or watchOS 26.6 or later to address the buffer overflow issue. Avoid connecting to untrusted NFS servers to prevent potential kernel memory corruption.

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