CVE-2026-43755 Overview
CVE-2026-43755 is a race condition vulnerability [CWE-362] affecting Apple macOS. A local application can exploit the flaw to gain root privileges on affected systems. Apple addressed the issue with improved state management in macOS Sonoma 14.8.8 and macOS Tahoe 26.6.
The vulnerability requires local access and high attack complexity, but successful exploitation yields full compromise of confidentiality, integrity, and availability. No public exploit code or in-the-wild exploitation has been reported at time of publication.
Critical Impact
A malicious app running with standard user privileges can win a race condition to elevate to root, obtaining complete control over the macOS host.
Affected Products
- Apple macOS Sonoma versions prior to 14.8.8
- Apple macOS Tahoe versions prior to 26.6
- Applications running locally on unpatched macOS installations
Discovery Timeline
- 2026-07-27 - CVE-2026-43755 published to the National Vulnerability Database
- 2026-07-28 - Last updated in NVD database
Technical Details for CVE-2026-43755
Vulnerability Analysis
The flaw is a race condition [CWE-362] in a privileged macOS component. Concurrent code paths access or modify shared state without adequate synchronization. An attacker with local, low-privileged access can time operations to interleave with the privileged process and manipulate state between validation and use.
Winning the race allows the attacker's application to influence a privileged action, resulting in escalation to root. Apple's advisory language indicates the fix restructures state management to eliminate the exploitable window. The CWE-362 classification aligns with typical Time-of-Check Time-of-Use (TOCTOU) patterns seen in prior macOS local privilege escalation issues.
Root Cause
The root cause is inadequate state management across concurrent execution paths. When multiple threads or processes access shared resources without proper locking or atomic operations, an attacker can inject operations that alter state between a security check and the corresponding action. Apple's remediation introduces improved state management primitives to serialize the affected operations.
Attack Vector
Exploitation requires local code execution on the target macOS system with at least low-privilege user context. No user interaction is required once the malicious code runs. The high attack complexity reflects the timing precision needed to reliably win the race. A successful exploit chain typically pairs this vulnerability with initial access techniques such as malicious application delivery, supply-chain compromise, or drive-by download.
No verified proof-of-concept code has been published. Refer to the Apple Security Advisory #128067 and Apple Security Advisory #128072 for vendor-supplied technical context.
Detection Methods for CVE-2026-43755
Indicators of Compromise
- Unexpected root-owned processes spawned from user-writable directories such as /Users/, /tmp/, or ~/Library/
- Sudden appearance of new LaunchDaemons in /Library/LaunchDaemons/ or modifications to files under /private/var/db/
- Anomalous setuid or posix_spawn activity followed by privilege transitions from a standard user to root
- Repeated, tightly-timed system calls from a single process indicating race-condition exploitation attempts
Detection Strategies
- Baseline privileged process creation on macOS endpoints and alert on new root-context executables launched by non-system parents
- Monitor Endpoint Security framework (ES_EVENT_TYPE_NOTIFY_EXEC, ES_EVENT_TYPE_NOTIFY_SETUID) events for unexpected privilege transitions
- Correlate high-frequency syscall bursts with subsequent privilege escalation events to surface race-condition exploitation patterns
Monitoring Recommendations
- Ingest macOS Unified Log data and Endpoint Security telemetry into a centralized analytics platform for behavioral correlation
- Track macOS build versions across the fleet and alert on hosts running versions earlier than 14.8.8 (Sonoma) or 26.6 (Tahoe)
- Watch for post-exploitation behaviors such as persistence installation, credential dumping from the keychain, and TCC database tampering
How to Mitigate CVE-2026-43755
Immediate Actions Required
- Update all macOS Sonoma systems to 14.8.8 and macOS Tahoe systems to 26.6 without delay
- Inventory macOS assets and prioritize patching for developer workstations, administrator systems, and hosts with sensitive data access
- Restrict installation of unsigned or untrusted applications through Gatekeeper policy and MDM configuration profiles
- Review recent application installations on unpatched hosts for signs of exploitation attempts
Patch Information
Apple released fixes in macOS Sonoma 14.8.8 and macOS Tahoe 26.6. Details are documented in Apple Security Advisory #128067 and Apple Security Advisory #128072. Apply updates through Software Update or your MDM platform.
Workarounds
- No vendor-provided workaround exists; patching is the only complete remediation
- Limit exposure by enforcing least-privilege user accounts and blocking unapproved application execution via allowlisting
- Enable System Integrity Protection (SIP) and ensure it remains active on all endpoints
# Verify installed macOS version and confirm patch status
sw_vers -productVersion
# Trigger software update check via command line
sudo softwareupdate --list
sudo softwareupdate --install --all --restart
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
