Apple Multiple Products Out-of-Bounds Write Vulnerability

Why it is Red

• CVSS 8.8 high
• Exploited in the wild (CISA KEV)
• Remotely exploitable without logging in

CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

• https://support.apple.com/en-us/149226
• https://support.apple.com/en-us/149228
• https://support.apple.com/en-us/149229
• http://seclists.org/fulldisclosure/2026/Sep/89
• http://seclists.org/fulldisclosure/2026/Sep/90
• http://seclists.org/fulldisclosure/2026/Sep/91
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86950

Original description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1, macOS Tahoe 26.7.1. Processing a maliciously crafted file may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 27.