CVE-2025-43346 Overview
CVE-2025-43346 is an out-of-bounds access vulnerability [CWE-125] affecting Apple's media processing components across multiple operating systems. Processing a maliciously crafted media file can lead to unexpected application termination or process memory corruption. The flaw requires local access and user interaction to trigger. Apple addressed the issue with improved bounds checking in iOS 18.7, iPadOS 18.7, iOS 26, iPadOS 26, macOS Tahoe 26, tvOS 26, visionOS 26, and watchOS 26.
Critical Impact
Attackers who deliver a crafted media file to a target device can crash applications or corrupt process memory, potentially enabling further exploitation chains.
Affected Products
- Apple iOS and iPadOS (versions prior to 18.7 and 26)
- Apple macOS Tahoe (versions prior to 26)
- Apple tvOS, visionOS, and watchOS (versions prior to 26)
Discovery Timeline
- 2025-09-15 - CVE-2025-43346 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-43346
Vulnerability Analysis
The vulnerability is an out-of-bounds access issue [CWE-125] in Apple's media file parsing logic. When a target application processes a maliciously crafted media file, the parser reads or accesses memory outside the intended buffer boundaries. This behavior results in application termination or corruption of process memory state.
Attackers must place the crafted file on the local system and induce the user to open it. The confidentiality and integrity impact is rated none, while availability impact is high due to the process crash and memory corruption behavior. Memory corruption in media parsers has historically served as a foundation for chained exploits targeting sandbox escape or code execution primitives.
Root Cause
The root cause is missing or insufficient bounds checking within the media file processing routines. When parsing structured fields inside a media container, the affected code fails to validate offsets or lengths before dereferencing buffers. Apple's fix introduces improved bounds validation to reject malformed input before the out-of-bounds access occurs.
Attack Vector
Exploitation requires local delivery of a crafted media file and user interaction to open it. Common delivery vectors include email attachments, messaging apps, downloaded files, and shared cloud storage. Successful exploitation causes unexpected app termination or memory corruption within the media-handling process.
No verified proof-of-concept has been published, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Apple Support Advisory #125110 for vendor technical details.
Detection Methods for CVE-2025-43346
Indicators of Compromise
- Unexpected termination of media-handling applications after opening a file from an untrusted source
- Crash reports referencing out-of-bounds reads or memory access violations in media framework components
- Presence of unsolicited or unusually structured media files delivered through email, messaging, or download channels
Detection Strategies
- Correlate application crash telemetry with recent file open events targeting media parsers
- Inspect crash logs on macOS (~/Library/Logs/DiagnosticReports/) and mobile device management crash feeds for signatures consistent with memory corruption in media components
- Hunt for delivery patterns where attackers push crafted media files to endpoints prior to observed crashes
Monitoring Recommendations
- Track OS version compliance across the fleet to identify endpoints below the patched builds
- Monitor endpoint telemetry for repeated crashes in the same media process, which may indicate exploitation attempts
- Enable centralized crash log collection so that anomalous media parser failures can be triaged quickly
How to Mitigate CVE-2025-43346
Immediate Actions Required
- Update all Apple devices to iOS 18.7, iPadOS 18.7, iOS 26, iPadOS 26, macOS Tahoe 26, tvOS 26, visionOS 26, or watchOS 26
- Enforce patch deployment through mobile device management for iOS, iPadOS, tvOS, visionOS, and watchOS fleets
- Advise users to avoid opening media files received from untrusted senders until patches are applied
Patch Information
Apple released fixes across its operating system portfolio. Consult the vendor advisories for build numbers and rollout guidance: Apple Support Advisory #125108, Apple Support Advisory #125109, Apple Support Advisory #125114, Apple Support Advisory #125115, and Apple Support Advisory #125116.
Workarounds
- Restrict automatic previewing of media files from untrusted sources in messaging and mail clients
- Apply device management policies that block delivery of unexpected media attachments to high-risk users
- Where patching is delayed, isolate legacy devices from workflows that require handling external media files
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
