Integer Overflow in macOS Products by Apple Leads to Heap Corruption Issues
CVE-2026-20639

7.5HIGH

Key Information:

Vendor

Apple
Status
Mac OS
Vendor
CVE Published:
25 March 2026

What is CVE-2026-20639?

A vulnerability in Apple’s macOS products allows for an integer overflow due to inadequate input validation. This critical flaw can be exploited through the processing of a maliciously crafted string, potentially resulting in heap corruption. The issue has been resolved in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, and macOS Tahoe 26.3, emphasizing the importance of staying updated to avoid exploitation.

Affected Version(s)

macOS 0 < 14.8.5

macOS 0 < 15.7.5

macOS 0 < 26.3

References

https://support.apple.com/en-us/126348
https://support.apple.com/en-us/126795
https://support.apple.com/en-us/126796

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.