CVE-2026-84524

Undergoing Analysis Undergoing Analysis - In Progress

Out-of-Bounds Read in Apple iOS and macOS Font Processing

Publication date: 2026-09-14

Last updated on: 2026-09-18

Assigner: Apple Inc.

Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. Processing a maliciously crafted font file may lead to unexpected app termination.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-14

Last Modified

2026-09-18

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-84524

Affected Vendors & Products

Vendor	Product	Version / Range
apple	ipados	to 26.7 (exc)
apple	iphone_os	to 26.7 (exc)
apple	macos	From 15.0 (inc) to 15.8 (exc)
apple	macos	From 26.0 (inc) to 26.7 (exc)
apple	visionos	to 27.0 (exc)
apple	watchos	to 27.0 (exc)
apple	tvos	to 27.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability where processing a maliciously crafted font file could cause unexpected app termination. It was fixed in multiple Apple operating systems including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.

Detection Guidance

This vulnerability involves processing maliciously crafted font files leading to out-of-bounds reads. Detection requires checking system and application logs for crashes or unexpected terminations when handling font files. Monitor for crashes in apps that process fonts, such as browsers or document viewers. Ensure your system is updated to the latest versions mentioned in the CVE description.

Impact Analysis

The vulnerability could lead to apps crashing unexpectedly when processing specially crafted font files. This may disrupt normal device operations and user experience.

Compliance Impact

The vulnerability involves an out-of-bounds read in font file processing that could lead to unexpected app termination. This type of issue may impact compliance with GDPR or HIPAA if it affects systems handling personal or health data, potentially causing data exposure or service disruptions. However, the provided CVE details do not specify direct compliance implications.

Mitigation Strategies

Immediately update affected systems to the fixed versions: iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, or watchOS 27. Avoid opening untrusted font files until the update is applied. Disable or restrict font processing in applications if updates are not immediately available.

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