CVE-2026-39877
Apple macOS Kernel Memory Disclosure Vulnerability
Description
A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8. An app may be able to disclose kernel memory.
INFO
Published Date :
July 27, 2026, 9:16 p.m.
Last Modified :
Aug. 17, 2026, 10:17 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-39877
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update macOS Sequoia to 15.7.8.
- Update macOS Sonoma to 14.8.8.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39877.
| URL | Resource |
|---|---|
| https://support.apple.com/en-us/128071 | Release Notes Vendor Advisory |
| https://support.apple.com/en-us/128072 | Release Notes Vendor Advisory |
| https://support.apple.com/en-us/148287 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39877 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39877
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39877 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39877 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'Apple', 'product': 'macOS', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '14.8.8', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '15.7.8', 'versionType': 'custom'}]}] [{'vendor': 'Apple', 'product': 'iOS and iPadOS', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '18.7.10', 'versionType': 'custom'}]}, {'vendor': 'Apple', 'product': 'macOS', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '14.8.8', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '15.7.8', 'versionType': 'custom'}]}] Changed 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. A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8. An app may be able to disclose kernel memory. Added Reference https://support.apple.com/en-us/148287 -
Initial Analysis by [email protected]
Jul. 29, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 14.0 up to (excluding) 14.8.8 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 15.0 up to (excluding) 15.7.8 Added Reference Type Apple Inc.: https://support.apple.com/en-us/128071 Types: Release Notes, Vendor Advisory Added Reference Type Apple Inc.: https://support.apple.com/en-us/128072 Types: Release Notes, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-119 Added SSVC {'id': 'CVE-2026-39877', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-28T14:21:02.752284Z'} -
New CVE Received by [email protected]
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apple', 'product': 'macOS', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '14.8.8', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '15.7.8', 'versionType': 'custom'}]}] Added 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. Added Reference https://support.apple.com/en-us/128071 Added Reference https://support.apple.com/en-us/128072