CVE-2026-1464 Overview
An Integer Overflow or Wraparound vulnerability has been identified in MuntashirAkon AppManager, specifically within the app/src/main/java/org/apache/commons/compress/archivers/tar modules. This vulnerability is associated with the program file TarUtils.java and affects all versions of AppManager prior to version 4.0.4.
Integer overflow vulnerabilities occur when arithmetic operations exceed the maximum value that can be stored in a variable, causing the value to wrap around to a smaller or negative number. In the context of TAR archive processing, this can lead to unexpected behavior when handling archive entries.
Critical Impact
Integer overflow in TAR archive handling could potentially lead to memory corruption, incorrect data processing, or application instability when processing specially crafted archive files.
Affected Products
- MuntashirAkon AppManager versions before 4.0.4
- Applications utilizing the affected TarUtils.java module
- Systems processing TAR archives through the vulnerable component
Discovery Timeline
- 2026-01-27 - CVE CVE-2026-1464 published to NVD
- 2026-01-27 - Last updated in NVD database
Technical Details for CVE-2026-1464
Vulnerability Analysis
This vulnerability exists in the TAR archive processing functionality within MuntashirAkon AppManager. The affected code resides in TarUtils.java, which is part of the Apache Commons Compress archiver modules integrated into the application. Integer overflow vulnerabilities in archive handling code are particularly concerning because they can affect how the application calculates buffer sizes, file lengths, or offset positions when parsing archive entries.
The vulnerability requires local access and user interaction to exploit, as a victim would need to open or process a maliciously crafted TAR archive file. The weakness is classified under CWE-190 (Integer Overflow or Wraparound), which describes scenarios where calculations produce values outside the representable range of the data type, leading to wraparound behavior.
Root Cause
The root cause of this vulnerability is improper validation of numeric values during TAR archive parsing operations in TarUtils.java. When processing archive metadata such as file sizes, timestamps, or offsets, the code performs arithmetic operations that can exceed the maximum value of the integer data type being used. Without proper bounds checking before these calculations, the resulting wraparound can cause the application to allocate incorrect buffer sizes or misinterpret archive entry boundaries.
Attack Vector
The attack vector for this vulnerability is local, requiring an attacker to craft a malicious TAR archive file and convince a user to open it with AppManager. The attack scenario would involve:
- An attacker creates a specially crafted TAR archive containing metadata values designed to trigger integer overflow conditions
- The malicious archive is delivered to the victim through social engineering, file sharing, or other means
- When the victim opens or extracts the archive using AppManager, the vulnerable TarUtils.java code processes the malformed metadata
- The integer overflow occurs during size or offset calculations, potentially causing memory issues or incorrect data handling
The vulnerability manifests in the TAR utility parsing routines when handling archive entry metadata. For technical details on the specific code changes addressing this issue, refer to the GitHub Pull Request #1598.
Detection Methods for CVE-2026-1464
Indicators of Compromise
- Presence of unusually large or malformed TAR archive files on the system
- AppManager application crashes or unexpected termination during archive operations
- Memory-related errors in application logs when processing TAR files
- Suspicious archive files with extreme or negative size values in their metadata
Detection Strategies
- Monitor for abnormal memory allocation patterns in AppManager processes
- Implement file integrity monitoring for downloaded archive files
- Review application logs for parsing errors or exceptions related to TAR archive handling
- Use endpoint detection solutions to identify exploitation attempts targeting archive handlers
Monitoring Recommendations
- Enable verbose logging for AppManager archive operations where available
- Monitor system resource usage for anomalies during archive extraction
- Implement behavioral analysis to detect unusual application behavior patterns
- Track file operations involving TAR archives from untrusted sources
How to Mitigate CVE-2026-1464
Immediate Actions Required
- Update MuntashirAkon AppManager to version 4.0.4 or later immediately
- Avoid opening TAR archives from untrusted or unknown sources until patched
- Implement application whitelisting to control archive handling software
- Review and validate any TAR archives received from external parties before processing
Patch Information
The vulnerability has been addressed in MuntashirAkon AppManager version 4.0.4. The fix is documented in GitHub Pull Request #1598, which contains the code changes that resolve the integer overflow issue in the TAR archive handling modules. Users should upgrade to version 4.0.4 or later to remediate this vulnerability.
Workarounds
- Use alternative archive extraction tools for TAR files until the update can be applied
- Implement network filtering to scan incoming archives for anomalies before delivery to endpoints
- Restrict AppManager's access to untrusted file locations through mobile device management policies
- Consider temporarily disabling TAR archive functionality if the feature is not essential to operations
# Verify AppManager version on Android device
# Check installed version in Settings > Apps > AppManager
# Ensure version is 4.0.4 or higher
# Alternative: Use ADB to check package version
adb shell dumpsys package io.github.muntashirakon.AppManager | grep versionName
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
