CVE-2026-33853 Overview
CVE-2026-33853 is a NULL Pointer Dereference vulnerability affecting MolotovCherry Android-ImageMagick7, an Android port of the popular ImageMagick image processing library. This vulnerability allows remote attackers to cause a denial of service condition by triggering a NULL pointer dereference during image processing operations. The flaw exists in versions prior to 7.1.2-10 and can be exploited over a network without authentication.
Critical Impact
Remote attackers can crash Android applications using the vulnerable Android-ImageMagick7 library by supplying specially crafted image files, resulting in denial of service conditions that affect application availability.
Affected Products
- MolotovCherry Android-ImageMagick7 versions before 7.1.2-10
Discovery Timeline
- 2026-03-24 - CVE CVE-2026-33853 published to NVD
- 2026-03-26 - Last updated in NVD database
Technical Details for CVE-2026-33853
Vulnerability Analysis
This vulnerability stems from a NULL Pointer Dereference condition (CWE-476) in the Android-ImageMagick7 library. When processing certain malformed or specially crafted image files, the library fails to properly validate pointer references before dereferencing them. This results in the application attempting to access memory at address zero, which causes an immediate crash.
The vulnerability is particularly concerning because ImageMagick is commonly used in mobile applications for image manipulation, thumbnail generation, and format conversion. An attacker can exploit this flaw by providing a malicious image file to any Android application using the affected library version.
Root Cause
The root cause is insufficient input validation and missing NULL pointer checks within the image processing routines. When the library encounters certain malformed image data, internal functions return NULL pointers that are subsequently dereferenced without verification. This is a classic instance of CWE-476 (NULL Pointer Dereference), where the code assumes pointers are always valid without proper defensive programming practices.
Attack Vector
The attack vector is network-based, requiring no authentication or user interaction beyond receiving and processing the malicious image. Exploitation scenarios include:
- Direct file upload: An attacker uploads a malicious image to an application that processes it using Android-ImageMagick7
- Content delivery: A malicious image is served from a compromised or malicious server to an Android application
- User-initiated processing: A user opens a malicious image file received via messaging or email
When the vulnerable library attempts to process the crafted image, the NULL pointer dereference occurs, crashing the application. While this vulnerability does not allow code execution or data theft, repeated exploitation can render applications unusable.
The vulnerability is exploitable remotely via the network with low attack complexity. No privileges are required, and the attack requires no user interaction beyond the application processing the malicious image. For detailed technical information, refer to the GitHub Pull Request #183 which contains the fix.
Detection Methods for CVE-2026-33853
Indicators of Compromise
- Unexpected application crashes during image processing operations
- Crash logs indicating segmentation faults or SIGSEGV signals in ImageMagick-related library code
- Repeated service restarts for applications handling user-supplied images
Detection Strategies
- Monitor application crash reports for patterns indicating NULL pointer dereference in image processing functions
- Implement application-level logging to track image processing failures and identify potentially malicious inputs
- Use crash analytics tools to detect abnormal crash rates in applications using Android-ImageMagick7
Monitoring Recommendations
- Enable crash reporting and analytics for Android applications using the Android-ImageMagick7 library
- Set up alerts for unusual patterns of application terminations or restarts
- Monitor system logs for process termination signals (SIGSEGV, SIGABRT) associated with image processing activities
How to Mitigate CVE-2026-33853
Immediate Actions Required
- Upgrade Android-ImageMagick7 to version 7.1.2-10 or later immediately
- Audit all Android applications in your environment for usage of the vulnerable library versions
- Consider implementing input validation for image files before passing them to the library
Patch Information
The vulnerability has been addressed through GitHub Pull Request #183. Organizations should update to Android-ImageMagick7 version 7.1.2-10 or later, which contains the fix for this NULL pointer dereference issue. The patch adds proper NULL pointer validation before dereferencing, preventing the crash condition.
Workarounds
- Implement application-level input validation to filter out malformed image files before processing
- Add exception handling around ImageMagick processing calls to gracefully handle crashes
- Consider sandboxing image processing operations to isolate potential crashes from affecting the main application
- Limit the image formats processed to only those strictly necessary for your application's functionality
# Update Android-ImageMagick7 dependency in build.gradle
# Replace the existing dependency version with the patched version:
# implementation 'com.github.MolotovCherry:Android-ImageMagick7:7.1.2-10'
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
