CVE-2026-64702 Overview
CVE-2026-64702 is an access control vulnerability [CWE-284] in Apple macOS that allows a malicious application to escape its sandbox. Apple addressed the issue with additional sandbox restrictions in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Applications running under the macOS sandbox rely on kernel-enforced restrictions to limit file, network, and inter-process access. A successful escape from this containment lets an attacker-controlled app operate with the broader privileges of the calling user, expanding the reach of any initial code execution primitive.
Critical Impact
An app running inside the macOS sandbox can bypass containment and access resources outside its entitlement scope, enabling further compromise of the host.
Affected Products
- Apple macOS Sequoia prior to 15.7.8
- Apple macOS Sonoma prior to 14.8.8
- Apple macOS Tahoe prior to 26.6
Discovery Timeline
- 2026-07-27 - CVE-2026-64702 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-64702
Vulnerability Analysis
The macOS App Sandbox confines applications to a restricted set of system resources using kernel-level policy enforcement and entitlements. CVE-2026-64702 stems from an access control flaw [CWE-284] within this sandbox enforcement path. A locally installed application can invoke a code path that is not adequately restricted, allowing it to reach resources or perform actions outside its declared sandbox profile.
Apple's advisory categorizes the fix as "additional sandbox restrictions," indicating that the original policy allowed operations the sandbox model intended to block. Once outside the sandbox, an app inherits the standard privileges of the invoking user, gaining access to user documents, credentials, and additional attack surface such as XPC services and privileged helper tools.
Root Cause
The root cause is improper access control in the sandbox mediation logic. The prior implementation permitted a sandboxed process to reach an interface or resource that should have been gated by an entitlement or policy rule. Apple's remediation tightens these restrictions rather than removing functionality, suggesting the fix adds new policy entries or narrows an existing allow rule.
Attack Vector
Exploitation requires code execution inside a sandboxed app on the target macOS system. An attacker delivers a crafted application through the Mac App Store, a signed distribution channel, or by convincing a user to run untrusted software. Once running, the app triggers the vulnerable path and obtains capabilities beyond its sandbox profile. No specific proof-of-concept or exploit code is publicly available at this time. See the Apple Support Document 128067, Apple Support Document 128071, and Apple Support Document 128072 for vendor details.
Detection Methods for CVE-2026-64702
Indicators of Compromise
- Sandboxed applications spawning child processes or accessing paths outside their container directory under ~/Library/Containers/<bundle-id>/.
- Unexpected access to user data directories such as ~/Documents, ~/Downloads, or Keychain files by apps with restrictive entitlements.
- Sandboxed processes issuing XPC calls to system services they do not normally interact with.
Detection Strategies
- Monitor Endpoint Security framework (ES_EVENT_TYPE_NOTIFY_EXEC, ES_EVENT_TYPE_NOTIFY_OPEN) telemetry for sandboxed apps performing file operations outside their container.
- Correlate sandboxd and kernel log entries reporting sandbox violations or policy denials followed by successful subsequent operations.
- Baseline expected entitlements per app bundle identifier and alert when runtime behavior exceeds the declared sandbox scope.
Monitoring Recommendations
- Enable unified logging capture of the com.apple.sandbox subsystem and ship events to a central analytics platform for retention and correlation.
- Track macOS build numbers across the fleet to identify hosts still running versions below 15.7.8, 14.8.8, or 26.6.
- Alert on installations of unsigned or ad-hoc signed applications, which are more likely to carry sandbox escape payloads.
How to Mitigate CVE-2026-64702
Immediate Actions Required
- Update all Macs to macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6 via Software Update.
- Inventory endpoints running unsupported macOS major versions and prioritize them for upgrade.
- Restrict installation of applications from unidentified developers using Gatekeeper policies enforced through MDM.
Patch Information
Apple released fixes in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Refer to Apple Support Document 128067, Apple Support Document 128071, and Apple Support Document 128072 for the full advisories and update procedures.
Workarounds
- Limit application execution to vetted, notarized software distributed through the Mac App Store or trusted internal channels.
- Enforce Gatekeeper and System Integrity Protection (SIP) on all endpoints and block user overrides through configuration profiles.
- Remove unnecessary sandboxed third-party applications until patches are deployed to reduce the local attack surface.
# Verify installed macOS version meets or exceeds the patched build
sw_vers -productVersion
# Trigger a software update check and install available updates
sudo softwareupdate --install --all --restart
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
