CVE-2026-29508 in ReadyMedia
Summary
by MITRE • 11/02/2026
ReadyMedia (formerly MiniDLNA) versions 1.3.0 through 1.3.3 contain a stack-based buffer overflow vulnerability that allows remote attackers to corrupt stack memory by crafting a malicious DFF audio file with an oversized PROP chunk size value that is used unvalidated to allocate a variable-length stack array and read file data into it. Attackers can place a crafted DFF file in a directory monitored by ReadyMedia to trigger automatic parsing via inotify, achieving remote code execution on unprotected builds or denial of service on hardened builds with stack protections.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in ReadyMedia, formerly known as MiniDLNA, versions 1.3.0 through 1.3.3 represents a critical security flaw rooted in improper input validation and unsafe memory management practices within the application's media parsing logic. This specific issue is classified under CWE-121, which denotes a stack-based buffer overflow condition. The core technical failure occurs when the software processes Digital Audio File Format (DFF) files, a high-resolution audio format often used in professional studio environments but increasingly common in consumer digital libraries. When ReadyMedia encounters a DFF file within a directory it monitors for media content updates, it initiates an automatic parsing routine to extract metadata and prepare the file for streaming or display. During this process, the application reads the PROP chunk header of the DFF file structure to determine the size of data that needs to be loaded into memory.
The fundamental technical flaw lies in the lack of bounds checking on the value extracted from the PROP chunk size field. The developer assumed that this value would always fall within a safe range suitable for stack allocation, failing to validate whether the specified length exceeded the capacity of the variable-length array allocated on the call stack. Consequently, when an attacker crafts a malicious DFF file containing an oversized or malformed PROP chunk size value, ReadyMedia proceeds to allocate a buffer based solely on this untrusted input and subsequently attempts to read the corresponding amount of data from the file into that stack-allocated space. This action results in writing data beyond the allocated boundaries, overwriting adjacent memory locations on the stack including return addresses, saved frame pointers, and other critical control flow metadata.
From an operational perspective, the impact of this vulnerability is severe due to the automatic nature of ReadyMedia's directory monitoring feature. The application utilizes Linux kernel features such as inotify to detect file system changes, meaning that simply placing a crafted DFF file into a watched directory triggers the vulnerable parsing routine without requiring any user interaction or explicit command execution by an administrator. This automation significantly lowers the barrier for exploitation, allowing remote attackers who have network access to the media server and write permissions to the monitored directories to trigger the flaw remotely. The exploitability is further heightened because DFF files are not as commonly scrutinized in security testing pipelines compared to more ubiquitous formats like MP3 or JPEG, potentially leaving this attack vector under-monitored by defensive systems.
The consequences of successful exploitation depend heavily on the compilation flags and operating system protections enabled for the ReadyMedia binary. On unprotected builds lacking modern stack protection mechanisms such as Stack Canaries (CWE-120), an attacker can precisely craft the overflow payload to overwrite the function's return address with a pointer to shellcode injected into the buffer or another executable memory region, thereby achieving arbitrary remote code execution with the privileges of the user running the ReadyMedia service. On hardened builds where stack protections are active, such as those compiled with -fstack-protector-strong or similar flags, the overflow will likely be detected during runtime, causing the application to abort and crash. In this scenario, the vulnerability results in a denial of service condition rather than code execution, disrupting media services for all connected clients until the process is restarted.
This incident aligns with several entries in the MITRE ATT&CK framework, particularly T1059 which covers command and script interpretation, as successful exploitation leads to remote code execution allowing attackers to run arbitrary commands on the host system. It also relates to T1203 regarding software exploitation techniques where vulnerabilities are leveraged for initial access or privilege escalation within a networked environment. The lack of input validation corresponds directly to CWE-20 Improper Input Validation, highlighting a failure in ensuring that data received from an external source is well-formed and safe for processing before being used in memory operations.
To mitigate this vulnerability, organizations running ReadyMedia versions 1.3.0 through 1.3.3 should immediately upgrade to version 1.3.4 or later where the issue has been patched by implementing strict bounds checking on chunk sizes prior to buffer allocation. Administrators who cannot update immediately should restrict write access to media directories to trusted users only and consider disabling automatic directory monitoring if feasible, forcing manual ingestion of new media files which allows for pre-scan validation. Additionally, deploying network-level controls such as intrusion prevention systems that can detect anomalous file uploads or malformed protocol structures may provide a layer of defense in depth against exploitation attempts targeting this specific parsing logic. Ensuring that the service runs with minimal privileges and utilizes OS-level hardening features like ASLR and stack protectors remains essential to reducing the blast radius should an exploit attempt occurs.