CVE-2026-28817 Overview
A race condition vulnerability exists in Apple macOS that allows a sandboxed process to circumvent sandbox restrictions. The vulnerability was addressed with improved state handling in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, and macOS Tahoe 26.4. This flaw enables malicious applications running within the macOS sandbox to escape containment and potentially access protected system resources or user data.
Critical Impact
Successful exploitation allows sandboxed applications to bypass security restrictions, potentially leading to unauthorized access to sensitive data, system resources, and privilege escalation on affected macOS systems.
Affected Products
- macOS Sequoia (versions prior to 15.7.5)
- macOS Sonoma (versions prior to 14.8.5)
- macOS Tahoe (versions prior to 26.4)
Discovery Timeline
- 2026-03-25 - CVE-2026-28817 published to NVD
- 2026-03-25 - Last updated in NVD database
Technical Details for CVE-2026-28817
Vulnerability Analysis
This vulnerability is classified as CWE-362 (Race Condition). The flaw exists in macOS's state handling mechanism, where a race condition can be exploited by a sandboxed process to bypass sandbox restrictions. The sandbox mechanism in macOS is designed to restrict application capabilities and isolate processes from sensitive system resources. However, due to improper synchronization in state handling, an attacker can manipulate the timing of operations to circumvent these protective measures.
The local attack vector requires the attacker to have the ability to execute code on the target system, though no privileges are required to initiate the attack. The scope is changed, meaning successful exploitation can impact resources beyond the vulnerable component's security authority, affecting confidentiality, integrity, and availability of the broader system.
Root Cause
The vulnerability stems from a race condition in macOS's state handling logic. Race conditions occur when the outcome of an operation depends on the timing or sequence of uncontrollable events. In this case, the sandbox enforcement mechanism fails to properly synchronize state checks, creating a window of opportunity where a sandboxed process can perform restricted operations before the security checks complete.
Attack Vector
The attack requires local access to the affected macOS system. An attacker would need to execute a malicious application within the sandbox environment. By carefully timing operations to exploit the race condition window, the attacker can cause the sandbox enforcement to fail, allowing the sandboxed process to access resources or perform actions that should be restricted.
The vulnerability mechanism involves exploiting timing gaps in the state validation process. When a sandboxed application requests access to a protected resource, there exists a brief window between the permission check and the actual resource access. By manipulating execution timing through techniques such as thread scheduling or resource contention, an attacker can cause the sandbox to incorrectly authorize an operation that should be denied.
Detection Methods for CVE-2026-28817
Indicators of Compromise
- Unexpected sandbox escape events logged in system security logs
- Sandboxed applications accessing files or resources outside their designated container
- Unusual process behavior where applications perform operations beyond their sandbox profile permissions
- System integrity protection (SIP) or sandbox violation alerts in unified logging
Detection Strategies
- Monitor macOS unified logs for sandbox violation attempts using log show --predicate 'subsystem == "com.apple.sandbox"'
- Implement endpoint detection rules to identify processes that spawn child processes with elevated or unexpected entitlements
- Deploy behavioral analysis to detect sandboxed applications exhibiting privilege escalation patterns
- Enable audit logging for file system access patterns that deviate from application sandbox profiles
Monitoring Recommendations
- Configure centralized log collection for macOS security events across enterprise endpoints
- Establish baseline behavior for sandboxed applications and alert on deviations
- Monitor for rapid successive system calls that may indicate race condition exploitation attempts
- Implement real-time alerting for sandbox escape indicators in SentinelOne console
How to Mitigate CVE-2026-28817
Immediate Actions Required
- Update macOS Sequoia to version 15.7.5 or later
- Update macOS Sonoma to version 14.8.5 or later
- Update macOS Tahoe to version 26.4 or later
- Review and restrict application installations to trusted sources only
- Audit currently installed applications for potential malicious behavior
Patch Information
Apple has released security updates addressing this vulnerability. Detailed patch information is available in the following Apple Support advisories:
Organizations should prioritize applying these patches through standard macOS update mechanisms or enterprise MDM solutions.
Workarounds
- Restrict application execution to only Apple-notarized and signed applications via Gatekeeper settings
- Implement strict application whitelisting policies to prevent execution of untrusted code
- Enable System Integrity Protection (SIP) if not already active to provide additional defense-in-depth
- Consider network segmentation to limit lateral movement potential if exploitation occurs
# Verify macOS version and check for available updates
sw_vers
softwareupdate --list
# Check System Integrity Protection status
csrutil status
# Review sandbox violations in system logs
log show --predicate 'subsystem == "com.apple.sandbox"' --last 24h
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
