CVE-2026-43807 Overview
CVE-2026-43807 is a buffer overflow vulnerability affecting multiple Apple operating systems. A malicious accessory can trigger unexpected application termination through improper bounds checking. Apple addressed the flaw by adding improved bounds validation across its product line. The weakness is classified under [CWE-120] (Buffer Copy without Checking Size of Input).
The vulnerability spans iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Apple issued fixes in iOS 26.5.2, iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6.
Critical Impact
A malicious accessory may exploit the buffer overflow to cause unexpected app termination, potentially leading to further memory corruption impacts across Apple's operating system portfolio.
Affected Products
- Apple iOS and iPadOS (fixed in 26.5.2)
- Apple macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.5.2
- Apple tvOS 26.6, visionOS 26.6, and watchOS 26.6
Discovery Timeline
- 2026-07-27 - CVE-2026-43807 published to NVD
- 2026-07-28 - Last updated in NVD database
Technical Details for CVE-2026-43807
Vulnerability Analysis
CVE-2026-43807 is a classic buffer overflow condition in the accessory-handling code path of Apple's operating systems. The vulnerable component fails to validate input size before copying data into a fixed-length buffer. When a malicious accessory sends crafted data, the copy operation writes beyond the allocated region.
The immediate observable impact is unexpected application termination. Buffer overflow conditions of this nature commonly enable adjacent memory corruption. That corruption can lead to code execution paths depending on process context and mitigations in place.
Apple's advisory confirms the fix uses improved bounds checking. The CWE-120 classification indicates missing size validation in a data copy operation, not a logic-level flaw.
Root Cause
The root cause is missing or insufficient bounds checking on data received from an attached accessory. Input from an accessory interface was accepted and copied without verifying that the source length fit the destination buffer. This shared code path exists across the Apple platform family, which is why the fix ships in seven operating systems simultaneously.
Attack Vector
Exploitation requires attacker-controlled input delivered through an accessory connection to the target device. The attacker must present a malicious accessory or emulate one that supplies malformed data to the vulnerable handler. Successful triggering causes the receiving application to crash, with potential for further impact through the memory corruption primitive.
Apple has not published proof-of-concept details for CVE-2026-43807. See the Apple Support Article #127594 and related advisories for platform-specific technical notes.
Detection Methods for CVE-2026-43807
Indicators of Compromise
- Repeated unexpected crashes of system or third-party applications shortly after connecting an accessory
- Crash reports referencing memory access violations in accessory-handling frameworks
- Presence of unfamiliar or unsigned accessories in device connection logs
Detection Strategies
- Collect and review .ips crash logs from managed Apple devices for repeated termination signatures tied to accessory subsystems
- Correlate accessory connection events with application crash telemetry via mobile device management (MDM) reporting
- Flag devices running operating system versions below the fixed builds (iOS/iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS/visionOS/watchOS 26.6)
Monitoring Recommendations
- Enforce MDM policies that inventory OS versions and alert when devices remain on vulnerable builds
- Monitor for anomalous USB, Lightning, or wireless accessory pairings in high-risk environments
- Ingest device crash and diagnostic telemetry into a centralized data lake for behavioral analysis across the fleet
How to Mitigate CVE-2026-43807
Immediate Actions Required
- Update all Apple endpoints to the fixed OS builds listed in Apple's advisories
- Restrict use of untrusted or unknown accessories on devices handling sensitive data
- Verify patch compliance through MDM reporting before re-enabling accessory use in restricted environments
Patch Information
Apple resolved CVE-2026-43807 with improved bounds checking. Patched versions are iOS 26.5.2, iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6. Refer to Apple Support Article #128068, Apple Support Article #128069, Apple Support Article #128070, Apple Support Article #128071, and Apple Support Article #128072 for platform-specific release notes.
Workarounds
- Disable use of third-party accessories on unpatched devices until updates are applied
- Enable USB Restricted Mode on iOS and iPadOS devices to limit accessory data access when locked
- Physically restrict accessory ports on high-value macOS endpoints where feasible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
