CVE-2026-20675: Apple OS Information Disclosure Flaw

CVE-2026-20675 Overview

CVE-2026-20675 is an out-of-bounds read vulnerability affecting multiple Apple operating systems. The vulnerability exists due to insufficient bounds checking during image processing operations. When a user processes a maliciously crafted image, the flaw can be exploited to disclose sensitive user information.

Critical Impact

Processing a maliciously crafted image may lead to unauthorized disclosure of user information across Apple's ecosystem of devices including macOS, iOS, iPadOS, watchOS, tvOS, and visionOS.

Affected Products

• watchOS 26.3
• tvOS 26.3
• macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4
• iOS 18.7.5 and iPadOS 18.7.5
• visionOS 26.3
• iOS 26.3 and iPadOS 26.3

Discovery Timeline

• 2026-02-11 - CVE CVE-2026-20675 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-20675

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory safety issue that occurs when software reads data past the end of an allocated buffer. In the context of image processing, this type of vulnerability typically manifests when parsing image metadata, color profiles, or pixel data without proper validation of size fields or offsets.

The attack requires local access and user interaction—specifically, the victim must open or preview a maliciously crafted image file. Once triggered, the out-of-bounds read can expose sensitive data from memory regions adjacent to the image processing buffer, potentially including user credentials, encryption keys, or other confidential information stored in process memory.

Root Cause

The root cause stems from inadequate bounds checking in Apple's image processing code. When parsing specially crafted image files, the affected component fails to properly validate buffer boundaries before performing read operations. This allows an attacker to craft image files with malformed headers or dimensions that cause the image parser to read beyond allocated memory regions.

Attack Vector

The attack vector is local, requiring an attacker to deliver a maliciously crafted image file to the target device. This could be accomplished through various means including email attachments, messaging applications, file sharing services, or web downloads. The vulnerability is triggered when the image is processed—this could occur during preview generation, thumbnail creation, or when the user explicitly opens the image.

The attack flow typically involves:

1. Attacker creates a specially crafted image file with malformed dimension fields or metadata
2. The malicious image is delivered to the victim through a social engineering vector
3. The victim's device processes the image (automatically or through user action)
4. The image parser reads beyond buffer boundaries, exposing memory contents
5. Sensitive user information is potentially disclosed to the attacker

Detection Methods for CVE-2026-20675

Indicators of Compromise

• Unusual image files with malformed headers or abnormally large dimension values
• Image processing crashes or unexpected application terminations when viewing specific images
• Unexplained memory access patterns in image handling components
• Presence of image files with suspicious metadata or embedded payloads

Detection Strategies

• Monitor for abnormal memory read patterns in image processing applications
• Implement file integrity monitoring for suspicious image files entering the environment
• Deploy endpoint detection rules for CWE-125 exploitation patterns targeting Apple image components
• Enable crash reporting and analyze core dumps for out-of-bounds read signatures

Monitoring Recommendations

• Configure SentinelOne agents to monitor image processing activity across Apple devices
• Enable verbose logging for applications that handle image files including Photos, Preview, and Mail
• Monitor network traffic for unusual image file transfers, particularly from untrusted sources
• Implement behavioral analysis to detect anomalous memory access during image rendering

How to Mitigate CVE-2026-20675

Immediate Actions Required

• Update all Apple devices to the latest patched operating system versions immediately
• Avoid opening image files from untrusted or unknown sources until patches are applied
• Enable automatic updates on all Apple devices to receive security patches promptly
• Review and restrict file sharing permissions to limit exposure to malicious content

Patch Information

Apple has addressed this vulnerability with improved bounds checks in the following software versions:

• watchOS 26.3
• tvOS 26.3
• macOS Tahoe 26.3
• macOS Sonoma 14.8.4
• macOS Sequoia 15.7.4
• iOS 18.7.5 and iPadOS 18.7.5
• visionOS 26.3
• iOS 26.3 and iPadOS 26.3

For detailed patch information, refer to Apple's security advisories:

• Apple Security Advisory #126346
• Apple Security Advisory #126347
• Apple Security Advisory #126348
• Apple Security Advisory #126349
• Apple Security Advisory #126350
• Apple Security Advisory #126351
• Apple Security Advisory #126352
• Apple Security Advisory #126353

Workarounds

• Disable automatic image preview in email clients and messaging applications
• Use third-party image viewers with sandboxed processing until patches are applied
• Implement network-level filtering to quarantine image files from untrusted sources for analysis
• Configure enterprise MDM policies to restrict the opening of image files from unknown sources

# Check current macOS version
sw_vers

# Update macOS via command line
softwareupdate --list
softwareupdate --install --all

# For iOS/iPadOS devices, navigate to:
# Settings > General > Software Update