CVE-2026-84524

App termination via FontParser out-of-bounds read

Published Sep 14, 2026 · Updated Sep 14, 2026

Out-of-bounds read in Apple FontParser allows attackers to terminate an app when an affected operating system processes a crafted font file. FontParser reads beyond a buffer boundary because the affected parser lacks the bounds check added by Apple; the specific routine and font field are undisclosed. Exploitation requires file processing on iOS or iPadOS before 26.7 or 27, macOS before 15.8, 26.7, or 27, or tvOS, visionOS, or watchOS before 27, and the documented consequence is app termination.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Apple FontParser allows attackers to terminate an app when an affected operating system processes a crafted font file. FontParser reads beyond a buffer boundary because the affected parser lacks the bounds check added by Apple; the specific routine and font field are undisclosed. Exploitation requires file processing on iOS or iPadOS before 26.7 or 27, macOS before 15.8, 26.7, or 27, or tvOS, visionOS, or watchOS before 27, and the documented consequence is app termination.

The record

CVE
CVE-2026-84524
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
T1204.002
Attack vector
Unavailable
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.7
  2. Affected versionversion=0 <27

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <26.7; version=0 <27
Apple · visionOSversion=0 <27
Apple · tvOSversion=0 <27
Apple · macOSversion=0 <15.8; version=0 <26.7; version=0 <27
Apple · watchOSversion=0 <27

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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