CVE-2026-20639 Integer overflow in macOS

What is CVE-2026-20639?

CVE-2026-20639 is a high-severity vulnerability in Apple Macos, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An integer overflow was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.3. Processing a maliciously crafted string may lead to heap corruption.

Weakness: CWE-190

Which versions are affected by CVE-2026-20639?

It affects 1 product.

Products include Apple Macos.

How do I fix CVE-2026-20639?

No fix has been published for CVE-2026-20639 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-20639 being exploited?

There is no known exploitation of CVE-2026-20639 in the wild and no public exploit code.

Other vulnerabilities in Apple Macos

• CVE-2026-65400 Apple macOS Improper Authentication Exploited Critical 9.8
• CVE-2024-44146 Security feature bypass in macOS Critical 10.0
• CVE-2024-44148 Security feature bypass in macOS Critical 10.0
• CVE-2023-38586 Security feature bypass in macOS Critical 10.0
• CVE-2023-40455 Security feature bypass in macOS Critical 10.0

All Apple Macos vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-7gg2-3r7f-v522.