About the security content of Xcode 26.4

This document describes the security content of Xcode 26.4.

About Apple security updates

For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security releases page.

Apple security documents reference vulnerabilities by CVE-ID when possible.

For more information about security, see the Apple Product Security page.

Xcode 26.4

otool

Available for: macOS Tahoe 26.2 and later

Impact: An app may be able to cause unexpected system termination

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2026-28890: Nathaniel Oh (@calysteon)

Simulator

Available for: macOS Tahoe 26.2 and later

Impact: An app may be able to read arbitrary files as root

Description: A permissions issue was addressed with additional restrictions.

CVE-2026-28889: Mihai Marin

Additional recognition

Dev Tools

We would like to acknowledge Nathaniel Oh (@calysteon) for their assistance.

otool

We would like to acknowledge Eddy T for their assistance.

Swift

We would like to acknowledge Banavath Aravind for their assistance.