CVE-2026-33856 Overview
CVE-2026-33856 is a Memory Leak vulnerability affecting MolotovCherry Android-ImageMagick7, an Android port of the ImageMagick image processing library. The vulnerability stems from a missing release of memory after effective lifetime (CWE-401), which can lead to resource exhaustion and denial of service conditions. This issue affects all versions of Android-ImageMagick7 prior to version 7.1.2-11.
Critical Impact
Attackers can exploit this memory leak vulnerability remotely without authentication to cause denial of service through memory exhaustion on Android devices running affected versions of Android-ImageMagick7.
Affected Products
- MolotovCherry Android-ImageMagick7 versions prior to 7.1.2-11
Discovery Timeline
- 2026-03-24 - CVE-2026-33856 published to NVD
- 2026-03-26 - Last updated in NVD database
Technical Details for CVE-2026-33856
Vulnerability Analysis
This vulnerability falls under CWE-401 (Missing Release of Memory after Effective Lifetime), a memory management flaw where allocated memory is not properly freed when it is no longer needed. In the context of Android-ImageMagick7, this creates a memory leak condition that can be exploited remotely over a network.
The vulnerability requires no privileges and no user interaction to exploit, making it particularly concerning for Android applications that process user-supplied or remote images. When triggered repeatedly, the memory leak can accumulate, eventually exhausting available system memory and causing the application or potentially the entire device to become unresponsive.
Root Cause
The root cause is improper memory management within the Android-ImageMagick7 library. Allocated memory resources are not being released after their effective lifetime has ended. This is a common programming error in C/C++ codebases where developers must manually manage memory allocation and deallocation. When image processing operations complete, the associated memory buffers and data structures are not being properly freed, leading to gradual memory consumption over time.
Attack Vector
The attack vector is network-based, allowing remote exploitation. An attacker can trigger the vulnerability by:
- Sending specially crafted image files to an application using Android-ImageMagick7
- Causing the library to process images that trigger the faulty code path
- Repeatedly exploiting the memory leak to exhaust available memory
- Resulting in denial of service when the application or device runs out of memory
The vulnerability mechanism involves image processing operations that allocate memory buffers but fail to release them upon completion. Technical details can be found in the GitHub Pull Request #191 which addresses this issue.
Detection Methods for CVE-2026-33856
Indicators of Compromise
- Abnormal memory consumption growth in applications using Android-ImageMagick7
- Applications processing images that exhibit memory leaks and eventual crashes
- Android device performance degradation when image processing functions are invoked
- Out-of-memory errors or application force-closes during image operations
Detection Strategies
- Monitor memory usage patterns in applications that integrate Android-ImageMagick7
- Implement application-level memory profiling to detect gradual memory increases
- Set up alerting for applications that exceed expected memory thresholds
- Review application logs for memory allocation failures or out-of-memory exceptions
Monitoring Recommendations
- Deploy Android application monitoring solutions to track memory utilization
- Establish baseline memory profiles for applications using image processing libraries
- Configure automatic alerting when memory consumption deviates significantly from baselines
- Implement periodic application restarts as a temporary mitigation while patching is performed
How to Mitigate CVE-2026-33856
Immediate Actions Required
- Update Android-ImageMagick7 to version 7.1.2-11 or later
- Review all Android applications using Android-ImageMagick7 for vulnerable versions
- Consider temporarily disabling image processing features if immediate patching is not possible
- Monitor affected applications for signs of memory exhaustion attacks
Patch Information
The vulnerability has been addressed in Android-ImageMagick7 version 7.1.2-11. The fix is documented in GitHub Pull Request #191. Organizations should prioritize updating their Android-ImageMagick7 dependency to the patched version to eliminate this vulnerability.
Workarounds
- Implement application-level memory limits to prevent complete resource exhaustion
- Add input validation to restrict the size and complexity of images processed by the library
- Consider implementing periodic application restarts to clear accumulated memory leaks
- Limit the rate of image processing requests to slow potential exploitation attempts
# Update Android-ImageMagick7 dependency in build.gradle
# Replace existing dependency version with patched version 7.1.2-11 or later
implementation 'com.github.MolotovCherry:Android-ImageMagick7:7.1.2-11'
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
