macOS memory corruption CVE-2026-39877 fixed in Sequoia 15.7.8/sonoma 14.8.8
CVE-2026-39877 Published on July 27, 2026
A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. An app may be able to disclose kernel memory.
Vulnerability Analysis
CVE-2026-39877 can be exploited with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Buffer Overflow Vulnerability?
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.
CVE-2026-39877 has been classified to as a Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2026-39877
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Affected Versions
Apple iOS and iPadOS:- Before 18.7.10 is affected.
- Before 26.5 is affected.
- Before 14.8.8 is affected.
- Before 15.7.8 is affected.
- Before 26.5 is affected.
- Before 26.5 is affected.
- Before 26.5 is affected.
- Before 26.5 is affected.