Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apple | iOS and iPadOS | < 18.7.1, < 26.0.1 | 18.7.1 |
| Apple | macOS | < 14.8.1, < 15.7.1, < 26.0.1 | 14.8.1 |
| Apple | tvOS | < 26.1 | 26.1 |
| Apple | visionOS | < 26.0.1 | 26.0.1 |
| Apple | watchOS | < 26.1 | 26.1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
csrXamfi/CVE-2025-43400 ★ 5 · Dec 12, 2025
CVE-2025-43400 (video + report)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- WID-SEC-2025-2157 Apple iOS, iPadOS and macOS (Font Parser): Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 30, 2025
References
- https://support.apple.com/en-us/125326
- https://support.apple.com/en-us/125327
- https://support.apple.com/en-us/125328
- https://support.apple.com/en-us/125329
- https://support.apple.com/en-us/125330
- https://support.apple.com/en-us/125338
- https://support.apple.com/en-us/125637
- https://support.apple.com/en-us/125639