CVE-2026-84564 Overview
CVE-2026-84564 is an uninitialized memory use vulnerability [CWE-457] affecting Apple's image processing components across multiple operating systems. Processing a maliciously crafted image can result in disclosure of process memory. Apple addressed the flaw with improved memory initialization in the affected image handling routines.
The vulnerability requires user interaction, typically by opening or previewing a crafted image. Successful exploitation leaks memory contents from the process handling the image, which may include sensitive data such as tokens, pointers, or fragments of adjacent buffers useful for bypassing address space layout randomization (ASLR).
Critical Impact
A remote attacker can leak process memory by delivering a crafted image, potentially exposing sensitive runtime data and aiding further exploitation.
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, macOS Golden Gate 27)
- Apple tvOS 27, visionOS 27, watchOS 27
Discovery Timeline
- 2026-09-14 - CVE-2026-84564 published to NVD
- 2026-09-18 - Last updated in NVD database
Technical Details for CVE-2026-84564
Vulnerability Analysis
The issue is a use of uninitialized memory in an Apple image parsing component. When decoding a maliciously crafted image, the affected code path reads from a memory region that was never initialized with defined values. The resulting data, drawn from prior allocations on the heap or stack, is then included in output accessible to the attacker.
This class of vulnerability is well-known for enabling memory disclosure primitives. While the flaw does not grant code execution, leaked pointers and heap contents frequently serve as building blocks for exploit chains that defeat ASLR. The network attack vector combined with the low complexity of image delivery makes exploitation practical through messaging apps, email, or web content.
Root Cause
The root cause is improper initialization of memory buffers used during image decoding. Specific fields or buffer regions were not zeroed or populated before being read back and returned to callers. Apple's fix explicitly cites improved memory initialization, aligning the remediation with the [CWE-457] weakness classification.
Attack Vector
Exploitation requires an attacker to deliver a specially crafted image to a target user. The victim must process or view the image using an affected Apple OS component. Because image previews are commonly generated automatically by messaging clients, mail apps, and browsers, the required user interaction can be minimal. The disclosed memory is limited to the process handling the image, but that process may hold credentials, message content, or address information relevant to further attacks.
No verified public exploit code or proof-of-concept has been published. See the Apple Security Update 149034 advisory and related bulletins for component-specific technical details.
Detection Methods for CVE-2026-84564
Indicators of Compromise
- Unexpected image files delivered via messaging platforms, email attachments, or web downloads that trigger crashes or anomalous behavior in image handling processes.
- Repeated processing of the same crafted image across multiple sessions, consistent with memory harvesting attempts.
- Outbound network activity from image preview or rendering processes following image ingest.
Detection Strategies
- Monitor Apple endpoints for OS versions below the fixed builds (iOS 26.7, iPadOS 26.7, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27) and prioritize them for patching.
- Inspect email and messaging gateways for image files with malformed headers or non-standard structures that fail strict format validation.
- Correlate crashes in image-related system frameworks with subsequent unusual process behavior on the same host.
Monitoring Recommendations
- Enable telemetry on macOS endpoints to capture process crashes and anomalous memory reads in image decoding components.
- Track version compliance across Apple mobile fleets using mobile device management (MDM) reporting to identify unpatched systems.
- Log and review inbound image attachments in high-risk mailboxes for further offline analysis.
How to Mitigate CVE-2026-84564
Immediate Actions Required
- Update all Apple devices to the fixed OS versions: iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Sequoia 15.8, macOS Tahoe 26.7, macOS Golden Gate 27, tvOS 27, visionOS 27, and watchOS 27.
- Enforce update compliance through MDM policies and block non-compliant devices from accessing sensitive resources.
- Advise users to avoid opening unsolicited images and disable automatic image previews in high-risk workflows where feasible.
Patch Information
Apple released fixes across its product line. Refer to the vendor bulletins for platform-specific details: Apple Security Update 149034, Apple Security Update 149035, Apple Security Update 149036, Apple Security Update 149037, Apple Security Update 149038, Apple Security Update 149041, Apple Security Update 149042, and Apple Security Update 149043.
Workarounds
- No official workaround exists; patching is the only definitive remediation.
- Reduce exposure by disabling automatic image rendering in messaging and email clients where the option is available.
- Restrict receipt of image attachments from untrusted senders through gateway filtering policies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
