CVE-2026-24875: Modizer Integer Overflow Vulnerability

CVE-2026-24875 Overview

CVE-2026-24875 is an Integer Overflow or Wraparound vulnerability (CWE-190) affecting yoyofr modizer, a music tracker player application. This issue allows attackers to exploit improper handling of integer arithmetic operations, potentially leading to memory corruption and arbitrary code execution when a user opens a maliciously crafted file.

Critical Impact

This vulnerability can be exploited locally with user interaction to achieve high impact on confidentiality, integrity, and availability of the affected system.

Affected Products

• yoyofr modizer versions prior to 4.1.1

Discovery Timeline

• 2026-01-27 - CVE CVE-2026-24875 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2026-24875

Vulnerability Analysis

This integer overflow vulnerability occurs when modizer performs arithmetic calculations on user-supplied values without proper bounds checking. When an integer value exceeds its maximum representable value, it wraps around to a small or negative number, leading to unexpected program behavior.

In the context of modizer, this vulnerability likely manifests during the parsing or processing of music tracker files. When the application allocates memory based on an overflowed calculation, it may allocate a significantly smaller buffer than intended. Subsequent operations that write data based on the original (pre-overflow) size would then write beyond the allocated buffer boundaries, resulting in heap or stack corruption.

The local attack vector requires user interaction, meaning an attacker must convince a victim to open a specially crafted file. However, given the nature of modizer as a music file player, users commonly open files from various sources, making this attack vector viable through social engineering or by hosting malicious files on music-sharing platforms.

Root Cause

The root cause is insufficient validation of integer arithmetic operations within the modizer application. When numeric values derived from file input are used in size calculations (such as for memory allocation or loop bounds), the application fails to verify that the result does not overflow the integer type's maximum value. This allows attackers to craft input that triggers wraparound behavior, bypassing intended size limits.

Attack Vector

An attacker can exploit this vulnerability by creating a malicious music tracker file that contains carefully crafted values designed to trigger the integer overflow. The attack scenario involves:

1. The attacker constructs a file with header values or embedded data that, when processed by modizer's parsing routines, cause an integer overflow during size calculation
2. The victim opens the malicious file using modizer (versions before 4.1.1)
3. The overflow results in undersized memory allocation followed by a buffer overflow during data processing
4. The attacker achieves arbitrary code execution in the context of the user running modizer

The vulnerability mechanism involves improper handling of integer arithmetic where multiplication or addition operations can exceed the maximum value of the integer type. For technical details on the fix implemented, refer to the GitHub Pull Request #133.

Detection Methods for CVE-2026-24875

Indicators of Compromise

• Unexpected crashes of the modizer application when opening certain music files
• Memory access violations or segmentation faults in modizer process logs
• Suspicious music tracker files with abnormally large or unusual header values
• Core dumps indicating heap or stack corruption in modizer

Detection Strategies

• Monitor for abnormal memory allocation patterns in modizer processes
• Implement file integrity monitoring for music file directories to detect potentially malicious files
• Deploy endpoint detection solutions capable of identifying memory corruption exploitation attempts
• Use application sandboxing to contain potential exploitation attempts

Monitoring Recommendations

• Enable crash reporting and analyze any modizer application crashes for signs of exploitation
• Monitor process behavior for signs of code execution following file operations
• Log and review any unusual file access patterns associated with modizer
• Implement behavioral analysis to detect post-exploitation activity following application crashes

How to Mitigate CVE-2026-24875

Immediate Actions Required

• Update modizer to version 4.1.1 or later immediately
• Avoid opening music tracker files from untrusted sources until patched
• Consider temporarily disabling or uninstalling vulnerable versions of modizer
• Implement application whitelisting to prevent execution of potentially malicious code

Patch Information

The vulnerability has been addressed in modizer version 4.1.1. The fix implements proper bounds checking for integer arithmetic operations to prevent overflow conditions. Users should update to the latest version by obtaining it from the official modizer repository.

For detailed information about the patch, see the GitHub Pull Request #133.

Workarounds

• Only open music tracker files from trusted, verified sources
• Run modizer in a sandboxed environment or virtual machine to limit potential impact
• Use operating system-level exploit mitigations such as ASLR and DEP/NX
• Consider using alternative music player applications until the patch is applied

# Verify modizer version (ensure 4.1.1 or later)
# Check your installation method for version verification commands

# If using a sandboxed environment on macOS:
sandbox-exec -p '(version 1)(allow default)(deny file-write*)' /path/to/modizer