CVE-2026-20639
Integer Overflow in macOS String Processing Causes Heap Corruption
Publication date: 2026-03-25
Last updated on: 2026-03-25
Assigner: Apple Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apple | macos | From 26.0 (inc) to 26.3 (exc) |
| apple | macos | From 14.0 (inc) to 14.8.5 (exc) |
| apple | macos | From 15.0 (inc) to 15.7.5 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-190 | The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an integer overflow issue that occurs due to insufficient input validation. Specifically, processing a maliciously crafted string can trigger this overflow, which may lead to heap corruption.
How can this vulnerability impact me? :
The impact of this vulnerability is that an attacker could exploit the integer overflow by providing a specially crafted string, potentially causing heap corruption. This could lead to unexpected behavior, crashes, or possibly allow further exploitation depending on the context.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update your macOS system to one of the fixed versions: macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, or macOS Tahoe 26.3.