Apple OS OOB Write (fixed in iOS 26.7/27)
CVE-2026-86876 Published on September 14, 2026
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed 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, visionOS 27, watchOS 27. A sandboxed process may be able to circumvent sandbox restrictions.
Vulnerability Analysis
CVE-2026-86876 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-86876 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-86876
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Affected Versions
Apple iOS and iPadOS:- Before 26.7 is affected.
- Before 27 is affected.
- Before 15.8 is affected.
- Before 26.7 is affected.
- Before 27 is affected.
- Before 27 is affected.
- Before 27 is affected.