mackron dr_libs W64 CUE Chunk Metadata Parsing dr_wav.h drwav__metadata_process_chunk cuePointCount integer overflow

Summaryinfo

A vulnerability labeled as critical has been found in mackron dr_libs. Affected by this issue is the function drwav__metadata_process_chunk of the file dr_wav.h of the component W64 CUE Chunk Metadata Parsing. Executing a manipulation of the argument cuePointCount can lead to integer overflow. This vulnerability is registered as CVE-2026-71261. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in mackron dr_libs (the affected version unknown). This vulnerability affects the function drwav__metadata_process_chunk of the file dr_wav.h of the component W64 CUE Chunk Metadata Parsing. The manipulation of the argument cuePointCount with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-71261 since 08/05/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/05/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Vendor

• mackron

Name

• dr_libs

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