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macOS: Processing malicious strings could cause system crashes
CVE-2026-20639
Summary
A security issue in macOS could cause system crashes if a hacker sends a specially crafted string. This issue is fixed in the latest updates for macOS Sequoia, Sonoma, and Tahoe. To stay safe, make sure your system is up to date with the latest software updates.
Original title
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 lea...
Original 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.
Published: 25 Mar 2026 · Updated: 25 Mar 2026 · First seen: 25 Mar 2026