Categories: Cyber Security News

Apple Font Parser Vulnerability Enables Malicious Fonts to Corrupt Process Memory

Apple has rolled out 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, affects a wide range of products, including the newly released macOS Tahoe and iOS 26, as well as older versions.

The vulnerability is an out-of-bounds write issue in FontParser. This type of memory safety flaw enables a program to write data beyond the end of an allocated buffer, resulting in unpredictable behavior.

An attacker could exploit this by embedding a specially crafted font in a document, email, or webpage. When a user interacts with this content, the vulnerable Font Parser component may be triggered, potentially leading to app termination or memory corruption.

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

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

It remains unclear whether the flaw could be leveraged for arbitrary code execution, which would be a more severe threat. However, the potential for denial-of-service attacks or memory corruption makes it a critical issue that needs to be addressed.

The security fix affects a wide range of Apple products, underscoring 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 strongly encouraged to apply the latest updates to all affected devices to mitigate any potential risk.

Apple Security Patches

Product	Patched Version
iOS & iPadOS	26.0.1
iOS & iPadOS	18.7.1
macOS Tahoe	26.0.1
macOS Sequoia	15.7.1
macOS Sonoma	14.8.1
visionOS	26.0.1

Follow us on Google News, LinkedIn, and X for daily cybersecurity updates. Contact us to feature your stories.

The post Apple Font Parser Vulnerability Enables Malicious Fonts to Corrupt Process Memory appeared first on Cyber Security News.

Font Parser Vulnerability in Apple Products Allows Process Crashes and Memory Corruption

Apple releases security update for macOS Sequoia 15.7.1 addressing CVE-2025-43400, a font parser vulnerability that could crash applications or corrupt memory through malicious fonts. Apple has issued an urgent security update for macOS Sequoia to address a significant vulnerability in its font parsing system that could allow attackers to crash…

September 30, 2025

In "Cyber Security News"

Critical binary-parser Node.js Vulnerability Enables Malicious Code Injection

The Software Engineering Institute’s CERT Coordination Center has disclosed a critical code injection vulnerability affecting the binary-parser library for Node.js. Tracked as CVE-2026-1245 and documented under Vulnerability Note VU#102648, the flaw potentially allows arbitrary JavaScript code execution in applications utilizing untrusted input for parser definitions. Vulnerability Details The binary-parser library,…

January 22, 2026

In "Cyber Security News"

Critical Vulnerability in Binary-Parser Library for Node.js Allows Malicious Code injection

A critical code-injection vulnerability has been identified in the Node.js binary-parser library, affecting all versions before 2.3.0. The flaw allows attackers to execute arbitrary JavaScript code if untrusted input is used to construct parser definitions, potentially compromising application integrity and system security. The binary-parser library, designed to facilitate writing efficient…

January 22, 2026

In "Cyber Security News"

rssfeeds-admin