CVE-2026-39877
Undergoing Analysis Undergoing Analysis - In Progress

Memory Corruption in macOS Kernel

Publication date: 2026-07-27

Last updated on: 2026-07-29

Assigner: Apple Inc.

Description
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8. An app may be able to disclose kernel memory.

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Meta Information

Published
2026-07-27
Last Modified
2026-07-29
Generated
2026-08-17
AI Q&A
2026-07-28
EPSS Evaluated
2026-08-15
NVD
CVE-2026-39877
EUVD
EUVD-2026-49520

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
apple macos From 14.0 (inc) to 14.8.8 (exc)
apple macos From 15.0 (inc) to 15.7.8 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

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Executive Summary

This is a memory corruption vulnerability where an app could potentially access and disclose kernel memory due to improper memory handling. It was fixed in macOS Sequoia 15.7.8 and macOS Sonoma 14.8.8.

Detection Guidance

This vulnerability is specific to macOS Sequoia 15.7.8 and macOS Sonoma 14.8.8 and involves kernel memory disclosure. Detection requires checking your macOS version and monitoring for unusual memory access patterns. Use 'sw_vers' to check your macOS version and 'sysctl vm.swappiness' to inspect memory handling settings.

Impact Analysis

An attacker could exploit this to read sensitive kernel memory, potentially exposing passwords, encryption keys, or other confidential data stored in memory.

Compliance Impact

This vulnerability involves potential disclosure of kernel memory, which could expose sensitive user data. Such data exposure risks non-compliance with GDPR (data protection) and HIPAA (health information privacy) due to unauthorized access to personal or protected health information.

Mitigation Strategies

Update to the latest patched versions of macOS Sequoia 15.7.8 or macOS Sonoma 14.8.8 to address the memory corruption issue.

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