Out-of-Bounds Write in iOS and iPadOS

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Apple Inc.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27. Processing maliciously crafted NTLM input may lead to unexpected app termination.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-14

Last Modified

2026-09-14

Generated

2026-09-15

AI Q&A

2026-09-15

EPSS Evaluated

N/A

NVD

CVE-2026-84531

Affected Vendors & Products

Vendor	Product	Version / Range
apple	ios	27
apple	ipad_os	27
apple	mac_os_golden_gate	27

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is an out-of-bounds write vulnerability caused by insufficient bounds checking. Maliciously crafted NTLM input could trigger unexpected app termination by writing data outside intended memory regions.

Impact Analysis

An attacker could exploit this to crash applications processing NTLM input, potentially leading to denial of service or other unexpected behavior on affected Apple devices running iOS, iPadOS, or macOS Golden Gate.

Mitigation Strategies

Update affected systems to iOS 27, iPadOS 27, or macOS Golden Gate 27 to address the out-of-bounds write issue. Avoid processing untrusted NTLM input until updates are applied.

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