Preface: My iPhone 15 pushed the iOS 26.4.2 update again on May 2, 2026. I think even if you installed it around April 24—is likely because Apple released a revised build of that same update to address continued issues, or my device failed to properly register the previous installation due to the emergency nature of the patch.

Background: Why I received the update again on 1st May 2026. The NVD’s last modified date is shown as April 29, 2026. Therefore, this is one of the reasons why I need to perform the analysis again. Why update again? Similar to previous scenarios in 2023, Apple often re-issues critical patches if the first version did not fully resolve the issue, was causing compatibility problems, or if new information about the vulnerability arose.

My observation: The April 29 update reinforces why your switch to PRAGMA secure_delete = ON; is the right move. The official fix description—”improved data redaction”—aligns with the behavior of secure_delete, which physically overwrites data to ensure it cannot be recovered via forensic tools.

By using the PRAGMA, you are implementing at the application level what Apple has now implemented at the OS level: ensuring that when a record is “deleted,” its physical remnants are immediately destroyed.

The following URL is the analysis report I published on April 24, 2026 – http://www.antihackingonline.com/cell-phone-iphone-android-windows-mobile/the-ghost-data-issue-has-been-fixed-in-ios-18-7-8-and-ipados-18-7-8-as-well-as-ios-26-4-2-and-ipados-26-4-2-24th-apr-2026/

Official announcement: Please refer to the link for details – https://nvd.nist.gov/vuln/detail/CVE-2026-28950

Preface: To be or not to be! Fixing this “bug” makes it easier for criminals to destroy evidence. However, leaving it unpatched leaves billions of innocent users vulnerable to forensic data theft if their phones are ever lost or stolen.

Background: Internally, iOS manages notifications through a system service called bulletinboard. The actual data is typically stored in a SQLite database file named deliverednotifications[.]sqlite, located in a protected system directory (usually /private/var/mobile/Library/BulletinBoard/).

The Freelist Mechanism: When iOS deletes a notification, SQLite does not immediately erase the data from the hard drive; instead, it marks the block as “Freelist.”

Fundamental Problem: The original binary data still exists in these blocks before they are overwritten by new data.

• Forensic Principle: Forensic tools can scan these unallocated spaces and directly extract the message content.

Vulnerability details: A logging issue was addressed with improved data redaction. This issue is fixed in iOS 18.7.8 and iPadOS 18.7.8, iOS 26.4.2 and iPadOS 26.4.2. Notifications marked for deletion could be unexpectedly retained on the device.

Official announcement: Please refer to the link for details –

https://nvd.nist.gov/vuln/detail/CVE-2026-28950

Preface: WLAN (Wi-Fi/Bluetooth) System: This is handled by the Qualcomm FastConnect 7800 Mobile Connectivity System. It manages Wi-Fi 7 and Bluetooth protocols independently of the 5G modem.

While they are integrated onto the same Snapdragon 8 Gen 3 platform and work together for features like Dual-SIM Dual-Active (DSDA) and interference cancellation to ensure smooth handovers between cellular and Wi-Fi, their firmware and management systems remain functionally separate.

Background: The processing of Neighbour Awareness Networking (NAN) service data frames via Qualcomm FastConnect (or similar WLAN chipsets) inherently involves the WLAN firmware buffer.

When a WLAN chip (such as those in the Qualcomm FastConnect series) receives data frames via Neighbourhood Aware Network (NAN) connections, the firmware plays a central role in handling the data path before it reaches the host processor.

Ref: In Qualcomm FastConnect (and similar chipsets), “self-startup” refers to the firmware autonomous mode where the WLAN chip manages NAN Discovery Windows and frame matching internally without waking the main application processor (AP).

Vulnerability details: Transient DOS when receiving a service data frame with excessive length during device matching over a neighbourhood awareness network protocol connection.

Vulnerability Type – CWE-126 Buffer Over-read

Access Vector – Remote

Official announcement: Please refer to the link for details – https://nvd.nist.gov/vuln/detail/CVE-2026-21381

Preface: The Mainline module (com[.]android[.]media[.]swcodec) contains software-onlycodecs. AMD does not touch these; they are strictly managed and updated by Google via the Play Store to ensure universal playback and security across all devices. For performance (like 4K video or gaming), AMD must provide its own hardware-accelerated codecs in the “vendor” partition of the device. To work with the Mainline system, AMD (or partners like those working on Android-x86) must implement Codec 2.0 (C2) drivers. This is the standard “language” the Android media framework uses to talk to any GPU—whether it’s Qualcomm, ARM, or AMD.

Background: Cybercriminals may exploit two design flaws to achieve their goals. Details are as follows:

Step 1. Entry Point: Malicious Media File

The user receives or encounters a specially crafted media file (e.g., via a messaging app or a website). No user interaction beyond opening the file or its preview is required.

Step 2. Step 1: Remote Code Execution (CVE-2026-0006)

Component: com[.]android[.]media[.]swcodec (Media Codecs Mainline).

Action: A heap buffer overflow occurs during the decoding process.

Result: The attacker gains System-level remote code execution. However, they are still “sandboxed” within the media process.

Step 3. Step 2: The “Zero-Copy” Hand-off (DMA-BUF)

Component: Codec 2.0 (C2) Driver Bridge.

Action: To maintain performance, the system uses DMA-BUF Heaps to pass the malicious buffer directly to the GPU without copying it.

Vulnerability Point: The system assumes the buffer boundaries are safe because they were “validated” by the software layer.

Step 4. Step 3: Privilege Escalation (CVE-2026-21385)

Vulnerability details:

CVE-2026-0006 (Critical System RCE): This is a heap buffer overflow in the Media Codecs Mainline component (com[.]android[.]media.swcodec). It allows for Remote Code Execution (RCE) without user interaction, often triggered by processing a specially crafted media file.

Official announcement: Please refer to the link for details –

https://nvd.nist.gov/vuln/detail/CVE-2026-0006

CVE-2026-21385 (High-Severity Qualcomm Graphics): This is a memory corruption flaw in a Qualcomm graphics/display component. It stems from an integer overflow during memory allocation, specifically related to how memory alignments are handled. 

Official announcement: Please refer to the link for details –

https://nvd.nist.gov/vuln/detail/CVE-2026-21385

Preface: As of March 8, 2026, Apple had released iOS 26.3.1 between March 4 and 5, 2026. Although you saw related news on March 7, this version mainly focused on bug fixes and performance optimizations for the major update released a few days earlier. The focus of this discussion is sandbox escape.

Background: iOS uses a centralized, kernel-level sandboxing system (Sandbox.kext) for all apps, primarily relying on a single default, complex profile named container.sb for all third-party applications. While the container is standard, iOS dynamically applies unique sandbox profiles to individual processes to restrict file system, hardware, and network access.

Apple states that App Groups allow multiple apps and extensions to access a shared container and perform interprocess communication.

That means:

• App ✅
• Widget ✅
• Extension ✅
  …can all touch the same file path, simultaneously, in different processes.

The sandbox permits this — it does not serialize it for you.

Vulnerability details: A logic issue was addressed with improved checks. This issue is fixed in watchOS 26.3, macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4, iOS 26.3 and iPadOS 26.3. An app may be able to break out of its sandbox.

Official announcement: Please refer to the link for details – https://nvd.nist.gov/vuln/detail/CVE-2026-20667

Preface: Swift is memory-safe by default. Unlike C, your enum and String cannot “overflow” a buffer and crash the app unless you use the Unsafe prefix.

Background: Swift is memory-safe by default. Use Enums to represent mutually exclusive states (e.g., loading, success, error) to eliminate “impossible” states. [.]onAppear { manager.fetchData() } will run every time the view appears, meaning every time SwiftUI reconstructs or re‑displays this DataView, it triggers fetchData() again.\ This can lead to multiple overlapping async calls unless explicitly prevented. The enum-based state machine helps protect against impossible logical states, but it does not prevent multiple requests from firing. Swift’s memory safety doesn’t stop logical repetition or resource exhaustion.

Ref: In Swift, “checking the bounds of a memory buffer” typically refers to ensuring you don’t access memory outside of an allocated range (like an Array or UnsafeBufferPointer).

Vulnerability details: CVE-2026-20700 A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, visionOS 26.3, iOS 26.3 and iPadOS 26.3. An attacker with memory write capability may be able to execute arbitrary code. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 and CVE-2025-43529 were also issued in response to this report.

Official announcement: Please refer to the link for details – https://nvd.nist.gov/vuln/detail/CVE-2026-20700

https://support.apple.com/en-us/126353