CVE-2026-88372 in libsndfile
Summary
by MITRE • 09/24/2026
libsndfile 1.2.2 contains an integer overflow vulnerability in mat4_read_header() when parsing crafted MAT4 (MATLAB v4) files.
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Analysis
by VulDB Data Team • 09/24/2026
The libsndfile library, a widely used open-source audio file format converter and reader, suffers from a critical integer overflow vulnerability within the function responsible for processing MATLAB version 4 data formats. This specific flaw is located in the mat4_read_header() routine, which handles the parsing of MAT4 files. The vulnerability arises during the calculation or allocation phase associated with reading header information from these specialized audio containers. When an attacker provides a maliciously crafted MAT4 file containing specially constructed values within its header structure, the library performs arithmetic operations that exceed the maximum limit for integer data types. This results in an integer overflow condition where the calculated size or offset wraps around to a significantly smaller value than intended by the application logic.
From a technical perspective, this flaw represents a classic instance of improper type conversion and insufficient boundary checking before memory allocation or array indexing. The CWE classification for this issue aligns with CWE-190 Integer Overflow or Wraparound, which occurs when an integer calculation exceeds the maximum value that can be represented by its data type. In the context of libsndfile, this overflow likely leads to a subsequent buffer over-read or out-of-bounds access because the system allocates memory based on the truncated size rather than the actual required size. Alternatively, it may cause the parser to read beyond the bounds of allocated buffers when processing the header fields, leading to unpredictable behavior depending on how the surrounding code handles the malformed data structures inherent in the crafted input file.
The operational impact of this vulnerability is severe for any application that relies on libsndfile to process audio files from untrusted sources. If an attacker can trick a user into opening a malicious MAT4 file within an application utilizing this library, they may achieve arbitrary code execution through exploitation of memory corruption mechanisms such as heap overflow or stack-based buffer overflows triggered by the subsequent processing steps. Even if full remote code execution is not immediately achievable due to modern mitigations like ASLR and DEP, the vulnerability can still be leveraged for denial-of-service attacks causing application crashes or segmentation faults. Furthermore, it poses a risk of information disclosure if the out-of-bounds read allows access to sensitive memory contents adjacent to the allocated buffer structures.
This type of vulnerability is frequently observed in multimedia processing libraries where performance optimization often leads developers to skip rigorous validation checks on input data sizes and offsets. The ATT&CK framework categorizes such exploitation techniques under Initial Access via Spearphishing Attachment or Execution through Application Layer Protocol, specifically targeting software that handles user-supplied media files. Attackers typically distribute these crafted files as attachments in emails or host them on compromised websites to trigger the vulnerability when a victim opens the file with vulnerable software like Audacity, VLC, or other audio editors linked against libsndfile.
Mitigation strategies for this issue primarily involve updating libsndfile to version 1.2.3 or later where the integer overflow has been patched by adding explicit checks before arithmetic operations and ensuring that all size calculations are validated against maximum allowable limits. Developers integrating libsndfile into their applications should ensure they are using a patched version of the library across all deployment environments. Additionally, implementing sandboxing for audio processing components can limit the blast radius if an exploit is attempted. Security teams should also monitor for indicators of compromise related to unusual memory access patterns or crashes in processes utilizing this library and consider deploying input validation rules at the application layer as a defense-in-depth measure to reject malformed MAT4 files before they reach the vulnerable parsing routines.