CVE-2026-109828 in libsndfile
Summary
by MITRE • 10/13/2026
A vulnerability was found in libsndfile up to 1.2.2. This issue affects the function wavlike_subchunk_parse of the file src/wavlike.c of the component WAV Parsing. Performing a manipulation results in use of uninitialized variable. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified within libsndfile versions up to 1.2.2 represents a critical memory safety flaw located in the WAV parsing component, specifically affecting the wavlike_subchunk_parse function found in src/wavlike.c. This defect is classified as an improper initialization of a variable prior to its use, which aligns with CWE-457 from the Common Weakness Enumeration taxonomy. The root cause lies in the logic governing how subchunks within WAV files are processed during parsing operations. When the parser encounters specific malformed or crafted input structures, it fails to properly initialize certain variables before they are accessed for further processing. This oversight creates a scenario where the application reads memory contents that have not been explicitly set by the program logic, leading to unpredictable behavior dependent on whatever data previously occupied those memory locations.
The operational impact of this vulnerability is significant due to its potential for remote exploitation and the availability of public exploit code. Because libsndfile is widely used in audio processing applications across various platforms including Linux, macOS, and Windows, an attacker can craft a malicious WAV file containing specific subchunk structures designed to trigger this uninitialized variable access. Upon opening or processing such a file within a vulnerable application, the program may exhibit undefined behavior. This typically manifests as crashes that could lead to denial of service conditions for end users. However, in more sophisticated attack scenarios involving memory corruption patterns associated with uninitialized reads, an attacker might leverage this flaw to leak sensitive information from the process memory space or potentially influence control flow if the uninitialized data affects pointer values or critical state variables. The presence of public exploit code significantly lowers the barrier to entry for attackers, increasing the likelihood of active exploitation in the wild against systems running unpatched versions of libsndfile.
From a threat intelligence perspective, this vulnerability maps closely to ATT&CK technique T1203 which covers Exploitation for Client Execution, as well as aspects of T1059 Command and Scripting Interpreter if the resulting crash or memory leak facilitates further script-based attacks within an application environment. The fact that the project was informed early via issue reports but has not yet responded highlights a critical gap in supply chain security and vendor responsiveness. This delay leaves users exposed to known risks for extended periods, emphasizing the importance of proactive monitoring and potential fallback strategies such as using alternative audio libraries or applying community-provided patches if available.
Mitigation strategies must focus on immediate remediation through software updates where possible. Users should upgrade libsndfile to version 1.2.3 or later once released by the maintainers. In environments where upgrading is not immediately feasible, implementing input validation at the application layer can help mitigate risk by filtering out malformed WAV files before they reach the vulnerable parsing function. Additionally, deploying runtime protection mechanisms such as Address Space Layout Randomization ASLR and Data Execution Prevention DEP can reduce the likelihood of successful exploitation even if the vulnerability is triggered. Security teams should also monitor for indicators of compromise related to unusual memory access patterns or crashes in audio processing services, as these may signal active attempts to exploit this specific flaw. Regular auditing of third-party dependencies and maintaining an up-to-date software bill of materials SBOM are essential practices to ensure rapid response when such vulnerabilities are disclosed by vendors who fail to address them promptly through official channels.