CVE-2025-43400
MediumCVSS 6.3Exploitation Probability (EPSS)
Very high risk94th percentile - higher than 94% of all known CVEs
Summary
An out-of-bounds write issue exists in Apple systems (iOS, iPadOS, macOS, tvOS, visionOS, watchOS), addressed with improved bounds checking. Processing a maliciously crafted font may lead to unexpected app termination or corrupt process memory.
Risk Assessment
A maliciously crafted font may cause app crashes or memory corruption, potentially exploitable for further attacks. The risk affects users opening untrusted content.
Recommendation
Update Apple systems to iOS 18.7.1/iPadOS 18.7.1, iOS 26.0.1/iPadOS 26.0.1, macOS Sequoia 15.7.1, macOS Sonoma 14.8.1, macOS Tahoe 26.0.1, tvOS 26.1, visionOS 26.0.1 or watchOS 26.1. Avoid opening untrusted font files until patched.
Other vulnerabilities in Apple iOS/iPadOS/macOS/tvOS/visionOS/watchOS
See all- CVE-2026-86881Critical
A certificate validation issue was found in Apple systems and fixed with improved certificate validation. An attacker with a compromised intermediate certificate authority may be able to issue certificates with arbitrary extended key usages.
- CVE-2026-84609Critical
A permissions issue in Apple systems was addressed with improved path validation. The flaw allowed an app to modify protected system files. The fix is available in iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27.
- CVE-2026-84561Critical
A double free issue in Apple systems allows an app to cause unexpected system termination or corrupt kernel memory. The flaw was fixed with improved memory management 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, and watchOS 27.
- CVE-2026-64733Critical
Data protection was improved. The issue affects iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6. An app may be able to fingerprint the user.
- CVE-2026-64729Critical
Memory management was improved for a use-after-free issue. The issue affects iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6. An app may be able to cause unexpected system termination.
- CVE-2026-64700Critical
A use after free issue was addressed with improved memory management. The vulnerability affects Apple systems and may allow an app to cause unexpected system termination.
- CVE-2026-43822Critical
A use after free issue was addressed with improved memory management. The vulnerability affects Apple systems and may allow an app to cause unexpected system termination.
- CVE-2026-43810Critical
The issue was addressed with improved memory handling. The vulnerability affects Apple systems and may allow a remote user to cause unexpected system termination or corrupt kernel memory.
- CVE-2026-43807Critical
A buffer overflow was addressed with improved bounds checking. The vulnerability affects Apple systems and may allow a malicious accessory to cause unexpected app termination.
- CVE-2026-43803Critical
An out-of-bounds write issue was addressed with improved bounds checking. The vulnerability affects Apple systems and may allow a remote attacker to cause unexpected system termination.
Original NVD description (English source)
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.1 and iPadOS 18.7.1, iOS 26.0.1 and iPadOS 26.0.1, macOS Sequoia 15.7.1, macOS Sonoma 14.8.1, macOS Tahoe 26.0.1, tvOS 26.1, visionOS 26.0.1, watchOS 26.1. Processing a maliciously crafted font may lead to unexpected app termination or corrupt process memory.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS