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Apple Font Parser Vulnerability Enables Malicious Fonts to Crash or Corrupt Process Memory

Apple has issued security updates across its operating systems to address a vulnerability in the Font Parser component that could allow malicious fonts to crash applications or corrupt process memory.

JBy Joseph CainSep 30, 20251 min read

Apple has issued security updates across its operating systems to address a vulnerability in the Font Parser component that could allow malicious fonts to crash applications or corrupt process memory.

The vulnerability, identified as CVE-2025-43400, impacts a wide range of products, including the newly released macOS Tahoe and iOS 26, as well as older versions.

This issue is an out-of-bounds write flaw in FontParser. Such memory safety issues can cause a program to write data beyond the end of an allocated buffer, leading to unpredictable behavior.

An attacker could exploit this by embedding a specially crafted font in a document, email, or webpage. Interaction with this content could trigger the vulnerable Font Parser component, potentially resulting in application termination or memory corruption.

Apple has addressed the issue by implementing improved bounds checking, ensuring the software remains within its designated memory space when processing font data.

According to Apple's advisory released on Fri, Sep 29, 2025, there are no known instances of this vulnerability being exploited in the wild.

Such memory safety issues can cause a program to write data beyond the end of an allocated buffer, leading to unpredictable behavior.
Joseph Cain · Thehackingpost

The potential for denial-of-service attacks or memory corruption makes it a critical issue that necessitates attention. The security fix impacts a wide range of Apple products, highlighting the shared codebase across its ecosystem.

While Apple also released updates for watchOS and tvOS, they did not include patches for this vulnerability. Users are encouraged to apply the latest updates to all affected devices to mitigate any potential risk.

Product Patched Version

iOS & iPadOS 26.0.1

iOS & iPadOS 18.7.1

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macOS Tahoe 26.0.1

macOS Sequoia 15.7.1

macOS Sonoma 14.8.1

visionOS 26.0.1

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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