CVE-2026-71261 in dr_libs
Summary
by MITRE • 08/05/2026
dr_libs dr_wav.h (all versions through current master) contains an integer overflow in W64 CUE chunk metadata parsing. In drwav__metadata_process_chunk(), a stage-1 capacity estimate truncates the 64-bit W64 chunk sizeInBytes to size_t before dividing by DRWAV_CUE_POINT_BYTES; on 32-bit builds this truncation causes the pre-allocated extra metadata capacity to be computed incorrectly. The subsequent read in drwav__read_cue_to_metadata_obj() computes the actual cue point count and allocation size using the full-precision, attacker-controlled cuePointCount field without cross-checking it against the stage-1 capacity estimate, and the only bounds enforcement on the resulting memory region (drwav__metadata_get_memory()) is a DRWAV_ASSERT, which compiles to a no-op under -DNDEBUG (the default for release builds). A crafted W64 WAV file can therefore cause a heap buffer overflow in any 32-bit application parsing untrusted WAV metadata.
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Analysis
by VulDB Data Team • 08/05/2026
The vulnerability exists within the dr_libs library's dr_wav.h implementation, specifically affecting all versions through the current master branch. This integer overflow occurs during the parsing of W64 CUE chunk metadata where the library performs a critical calculation that exposes a fundamental flaw in capacity estimation for 32-bit systems. The issue manifests in the drwav__metadata_process_chunk() function where a 64-bit chunk size value stored in the W64 format is truncated to size_t type before undergoing division operations, creating an incorrect pre-allocation estimate for metadata storage.
The technical exploitation pathway begins with the truncation of the 64-bit W64 chunk size InBytes field, which fundamentally alters how the library calculates memory requirements for CUE point processing. This stage-1 capacity estimation error becomes particularly dangerous on 32-bit build environments where the size_t type cannot properly represent large values that exceed 32-bit limits. The subsequent drwav__read_cue_to_metadata_obj() function then retrieves the actual cue point count from the attacker-controlled cuePointCount field without performing any cross-verification against the previously computed stage-1 capacity estimate, creating a direct path for memory corruption.
The operational impact of this vulnerability is severe for applications that process untrusted WAV metadata on 32-bit platforms, as it enables heap buffer overflow conditions through carefully crafted W64 WAV files. The library's memory allocation system lacks proper bounds checking beyond a DRWAV_ASSERT macro that becomes inactive in release builds due to the -DNDEBUG compilation flag, effectively removing all safety nets for memory boundary violations. This vulnerability aligns with CWE-190, Integer Overflow or Wraparound, and specifically demonstrates characteristics of CVE-2023-XXXX where integer overflows lead to memory corruption vulnerabilities.
The attack vector requires an adversary to construct a malicious W64 WAV file containing oversized cue point counts that exceed the truncated capacity estimate, causing the library to allocate insufficient memory for processing. When the application attempts to read the actual cue points, it writes beyond allocated heap boundaries, potentially leading to arbitrary code execution or application crashes. This vulnerability falls under ATT&CK technique T1203, Exploitation for Client Execution, and represents a classic example of how integer overflows in multimedia libraries can be leveraged for remote code execution in 32-bit applications processing untrusted media content.
The mitigation strategy requires immediate patching of the library to implement proper bounds checking that validates attacker-controlled values against pre-calculated capacity limits before proceeding with memory allocation. Developers should ensure that all size calculations maintain precision across different platform architectures and implement explicit checks that prevent truncation-based integer overflows in metadata parsing operations. Additionally, applications processing untrusted WAV files should be compiled with appropriate debug flags or alternative bounds checking mechanisms to prevent release builds from silently ignoring critical memory safety validations. The fix must address the core issue of capacity estimation truncation while maintaining backward compatibility and performance characteristics essential for multimedia processing applications.
This vulnerability demonstrates the critical importance of proper integer handling in multimedia format parsers, particularly when dealing with 64-bit file formats that must operate correctly on 32-bit platforms. The security implications extend beyond simple buffer overflows to include potential privilege escalation scenarios where attackers could leverage this vulnerability to execute arbitrary code within applications that process audio files. The remediation approach should focus on implementing robust input validation and memory safety mechanisms that prevent similar integer overflow conditions from occurring in other parts of the library's metadata processing pipeline.
Organizations deploying applications using dr_libs should conduct immediate security assessments to identify affected systems running 32-bit builds, particularly those processing untrusted audio content. The vulnerability affects any application that relies on the library for WAV file parsing, including media players, audio editing software, and content management systems that handle user-uploaded audio files. System administrators should prioritize patching efforts and consider implementing additional security controls such as sandboxing or input sanitization when processing multimedia content from untrusted sources to mitigate potential exploitation of this vulnerability in environments where immediate patching is not feasible.