CVE-2026-32256 in music-metadata
Summary
by MITRE • 03/18/2026
music-metadata is a metadata parser for audio and video media files. Prior to version 11.12.3, music-metadata's ASF parser (`parseExtensionObject()` in `lib/asf/AsfParser.ts:112-158`) enters an infinite loop when a sub-object inside the ASF Header Extension Object has `objectSize = 0`. Version 11.12.3 fixes the issue.
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Analysis
by VulDB Data Team • 03/22/2026
The vulnerability identified as CVE-2026-32256 affects the music-metadata library, a widely used tool for extracting metadata from audio and video media files across various platforms and applications. This library serves as a critical component in media processing pipelines, digital asset management systems, and multimedia applications that require accurate metadata extraction from diverse file formats. The issue specifically resides within the Advanced Systems Format (ASF) parser implementation, which handles metadata extraction from ASF container files commonly used in Windows Media Audio and Windows Media Video formats. The vulnerability represents a classic denial-of-service scenario that can severely impact applications relying on this library for media processing workflows.
The technical flaw manifests in the `parseExtensionObject()` function located within the `lib/asf/AsfParser.ts` file at lines 112-158. When the ASF parser encounters a sub-object within the ASF Header Extension Object where the `objectSize` field is explicitly set to zero, the parsing logic enters an infinite loop condition. This occurs because the parser's loop termination criteria are based on the object size value, and when this value becomes zero, the loop continues indefinitely without proper exit conditions. The vulnerability stems from inadequate input validation and boundary checking within the parsing algorithm, where the code fails to account for edge cases where object size parameters might legitimately be zero or improperly formatted. This type of flaw aligns with CWE-835, which specifically addresses infinite loops in programming constructs.
The operational impact of this vulnerability extends beyond simple application crashes or hangs, potentially affecting entire media processing systems and workflows. Applications utilizing the affected music-metadata library could experience complete service disruption when processing ASF files containing malformed extension objects, leading to resource exhaustion and system instability. This vulnerability particularly affects systems that process untrusted media files, such as content management systems, media streaming platforms, and digital asset repositories. The infinite loop condition consumes CPU resources continuously, potentially causing cascading failures in multi-threaded applications where multiple parsing operations occur simultaneously, making this vulnerability a significant concern for production environments. From an attacker's perspective, this represents a straightforward denial-of-service vector that can be exploited with minimal technical expertise.
Mitigation strategies for this vulnerability require immediate upgrading to version 11.12.3 or later, which implements proper bounds checking and exit conditions for the parsing loop. System administrators should conduct comprehensive vulnerability assessments to identify all applications and services that depend on the music-metadata library, ensuring complete remediation across the entire infrastructure. Additional defensive measures include implementing input validation layers that sanitize media file headers before processing, establishing resource limits and timeouts for parsing operations, and deploying monitoring solutions to detect unusual CPU utilization patterns indicative of infinite loop conditions. Organizations should also consider implementing automated patch management processes to ensure timely deployment of security updates across their software ecosystems. The fix implemented in version 11.12.3 demonstrates proper adherence to secure coding practices by incorporating robust boundary checking and ensuring loop termination conditions are properly validated against zero-sized objects. This vulnerability highlights the importance of defensive programming techniques and comprehensive testing of edge cases in media processing libraries, particularly those handling binary format parsing where malformed input can lead to catastrophic execution behavior.