What is CVE-2026-20639?

CVE-2026-20639 is a high-severity vulnerability in Apple Macos, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-03-25.

How severe is CVE-2026-20639?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Apple Macos

CVE-2026-20639

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.

Vulnerability class: Integer Overflow

EPSS: 0.006 (45.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-20639?: CVE-2026-20639 is a high-severity vulnerability in Apple Macos, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-03-25.
How severe is CVE-2026-20639?: High severity. CVSS v3 base score is 7.5 out of 10.