CVE-2026-20639

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-25 · updated 2026-06-17
Weakness: CWE-190

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.

Affected products

Apple macOS: from 14.0 before 14.8.5; from 15.0 before 15.7.5; from 26.0 before 26.3 — fixed in 14.8.5, 15.7.5, 26.3

How to fix

Upgrade to a fixed version: Apple macOS 14.8.5, 15.7.5, 26.3. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2026-20639 or the next vulnerability affects your stack