CVE-2026-84620 Overview
CVE-2026-84620 is an integer overflow vulnerability [CWE-190] affecting Apple's 3D model processing components across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Processing a maliciously crafted 3D model may lead to memory corruption. Apple addressed the flaw by adding improved input validation to the affected code paths. The vulnerability requires local access and user interaction, but successful exploitation compromises the confidentiality, integrity, and availability of the target device.
Critical Impact
A maliciously crafted 3D model file can trigger memory corruption on unpatched Apple devices, providing attackers a pathway to code execution or denial of service in the process handling the model.
Affected Products
- Apple iOS and iPadOS (fixed in iOS 26.7 / iPadOS 26.7 and iOS 27 / iPadOS 27)
- Apple macOS (fixed in macOS Sequoia 15.8, macOS Tahoe 26.7, and macOS Golden Gate 27)
- Apple tvOS 27, visionOS 27, and watchOS 27
Discovery Timeline
- 2026-09-14 - CVE-2026-84620 published to the National Vulnerability Database (NVD)
- 2026-09-18 - Last updated in NVD database
Technical Details for CVE-2026-84620
Vulnerability Analysis
The vulnerability resides in Apple's 3D model parsing logic, which fails to properly validate numeric fields describing geometry, buffer sizes, or index counts within a model file. When a specially crafted model supplies large or unexpected values, arithmetic operations on those values wrap around beyond the range of the underlying integer type. The wrapped result is then used as the size for a subsequent buffer allocation or indexing operation, leading to memory corruption.
Because the flaw is triggered during content parsing, any process that opens or renders the malicious 3D asset is exposed. This includes system services and applications across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS that rely on the shared Apple 3D processing components.
Root Cause
The root cause is classified as [CWE-190] Integer Overflow or Wraparound. The parser performs unchecked arithmetic on attacker-controlled length or count fields inside the 3D model. When the calculation exceeds the maximum representable value, the result silently wraps, and downstream logic assumes the value is valid. Apple's advisories state the fix introduces additional input validation on those fields before allocations occur.
Attack Vector
The attack vector is local and requires user interaction. An attacker must deliver a malicious 3D model, for example through a downloaded file, message attachment, email, or web content, and convince the user to open or preview it. No elevated privileges are required to trigger the parser, and successful exploitation can corrupt memory within the affected process, potentially enabling arbitrary code execution or crashes.
No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Apple Support advisories for the affected components.
Detection Methods for CVE-2026-84620
Indicators of Compromise
- Unexpected crashes or EXC_BAD_ACCESS reports in system logs referencing 3D model or scene processing frameworks on Apple platforms.
- Presence of untrusted 3D model files (for example .usdz, .obj, .dae) received via messaging, email, or web downloads on devices running unpatched OS versions.
- Anomalous child processes or memory growth in applications that render 3D content shortly after opening an external asset.
Detection Strategies
- Inventory Apple endpoints and compare installed OS build numbers against the fixed versions listed in Apple's advisories to identify unpatched systems.
- Monitor endpoint telemetry for crash signatures in processes that handle 3D assets, particularly following the opening of files from untrusted sources.
- Inspect email and web gateways for inbound 3D model file types originating from untrusted senders or domains.
Monitoring Recommendations
- Ingest macOS unified logs and iOS crash reports into a centralized analytics platform to correlate parser crashes across the fleet.
- Alert on repeated crashes of the same process on a single endpoint, which may indicate exploitation attempts against the 3D parsing code.
- Track software update compliance on Apple devices and generate alerts for endpoints that remain on vulnerable OS versions beyond the patch window.
How to Mitigate CVE-2026-84620
Immediate Actions Required
- Deploy the Apple security updates that address CVE-2026-84620 across all managed iOS, iPadOS, macOS, tvOS, visionOS, and watchOS devices.
- Prioritize devices used to open external files, such as executive laptops, developer workstations, and shared iPads.
- Advise users not to open 3D model files received from untrusted senders until patches are applied.
Patch Information
Apple fixed the vulnerability in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27. Detailed component information is available in the corresponding Apple advisories: Apple Support 149034, 149035, 149036, 149037, 149038, 149041, 149042, and 149043.
Workarounds
- Block or quarantine 3D model file types at email and web gateways until endpoints are patched.
- Disable automatic previews of file attachments in messaging and mail clients where feasible.
- Restrict installation of applications that render 3D content on unpatched managed devices through mobile device management (MDM) policies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
