CVE-2026-43692: Apple macOS RCE Vulnerability

CVE-2026-43692 Overview

CVE-2026-43692 is an input validation vulnerability affecting Apple macOS. A remote attacker can trigger unexpected application termination or execute arbitrary code by supplying crafted input that bypasses sanitization routines. Apple addressed the flaw by improving input sanitization in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7.

The vulnerability is classified under [CWE-20] Improper Input Validation. Exploitation requires user interaction, and successful attacks compromise confidentiality, integrity, and availability. Apple published corresponding advisories describing the fix across multiple supported macOS release trains.

Critical Impact
A remote attacker can cause application crashes or achieve arbitrary code execution on unpatched macOS systems when a user interacts with malicious content.

Affected Products

Apple macOS versions prior to Golden Gate 27
Apple macOS Sequoia versions prior to 15.8
Apple macOS Tahoe versions prior to 26.7

Discovery Timeline

2026-09-14 - CVE-2026-43692 published to the National Vulnerability Database
2026-09-15 - Last updated in NVD database

Technical Details for CVE-2026-43692

Vulnerability Analysis

CVE-2026-43692 stems from improper input validation in a macOS component that processes remotely supplied data. Apple's advisories confirm the fix was implemented by strengthening input sanitization, indicating that the affected code path accepted malformed input that violated expected structural or semantic constraints.

When the vulnerable component parses attacker-controlled content, insufficient validation allows corrupted state to propagate into downstream processing. This can result in an unexpected app termination through a crash, or, under the right memory conditions, arbitrary code execution within the affected process context. The attack requires user interaction, meaning a victim must open or interact with content delivered by the attacker.

Apple has not published component-level technical details in the referenced advisories. Refer to Apple Support Document #149035, Apple Support Document #149042, and Apple Support Document #149043 for the vendor's official disclosure.

Root Cause

The root cause is missing or insufficient input sanitization in a macOS component that accepts remote input. The vendor's remediation description explicitly cites improved input sanitization as the fix, consistent with the [CWE-20] classification.

Attack Vector

The attack vector is network-based with low complexity. An attacker delivers crafted content to a target, and once the user opens or processes the content, the vulnerable code path is triggered. No prior authentication is required.

No public proof-of-concept exploit code has been observed. Apple has not disclosed exploitation-specific implementation details.

Detection Methods for CVE-2026-43692

Indicators of Compromise

Unexpected termination or repeated crash reports of macOS applications that process remote content, correlated with recently opened files or URLs from untrusted sources.
Diagnostic reports in ~/Library/Logs/DiagnosticReports/ referencing unusual faulting addresses or malformed input structures.
Outbound connections from newly spawned child processes following user interaction with attacker-delivered content.

Detection Strategies

Monitor endpoint telemetry for macOS process crashes followed by anomalous child process creation or persistence attempts.
Correlate email and web gateway logs with endpoint crash events to identify potential delivery of crafted payloads.
Track version inventory across the macOS fleet to identify hosts running builds earlier than Golden Gate 27, Sequoia 15.8, or Tahoe 26.7.

Monitoring Recommendations

Enable and centralize macOS unified logging (log collect) to capture crash and exception events for retrospective analysis.
Alert on suspicious use of launchd, osascript, or shell interpreters spawned immediately after application crashes.
Baseline application behavior on managed macOS endpoints to surface anomalous code execution patterns following user interaction with external content.

How to Mitigate CVE-2026-43692

Immediate Actions Required

Upgrade affected systems to macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7 as applicable to the installed release train.
Prioritize patching for endpoints handling high volumes of external content such as email, browsing, or file sharing workloads.
Instruct users to avoid opening unsolicited files or links from untrusted sources until patches are deployed.

Patch Information

Apple released fixes in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. Refer to Apple Support Document #149035, Apple Support Document #149042, and Apple Support Document #149043 for exact build numbers and release notes.

Workarounds

No official workaround has been published by Apple; applying the vendor patch is the supported remediation.
Reduce exposure by restricting user interaction with untrusted remote content on unpatched systems.
Enforce least-privilege configurations and application allowlisting to limit the impact of successful exploitation.

bash

# Verify installed macOS version and apply available updates
sw_vers
sudo softwareupdate --list
sudo softwareupdate --install --all --restart