Schreibfaul1 ESP32-audioI2S 3.4.5 MP3 Decoder mp3_decoder.cpp MP3Decoder::decode mainDataBegin/nSlots buffer overflow

Summaryinfo

A vulnerability classified as critical was found in Schreibfaul1 ESP32-audioI2S 3.4.5. Impacted is the function MP3Decoder::decode of the file src/mp3_decoder/mp3_decoder.cpp of the component MP3 Decoder. Such manipulation of the argument mainDataBegin/nSlots leads to buffer overflow. This vulnerability is traded as CVE-2026-51251. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Schreibfaul1 ESP32-audioI2S 3.4.5. It has been rated as critical. Affected by this issue is the function MP3Decoder::decode of the file src/mp3_decoder/mp3_decoder.cpp of the component MP3 Decoder. The manipulation of the argument mainDataBegin/nSlots with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Schreibfaul1 ESP32-audioI2S 3.4.5 has a buffer overflow vulnerability in the MP3Decoder::decode() function of the MP3 decoder due to missing size validation on untrusted mainDataBegin and nSlots values.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-51251 since 06/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/28/2026).

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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Productinfo

Vendor

• Schreibfaul1

Name

• ESP32-audioI2S

Version

• 3.4.5

Website

• Product: https://github.com/schreibfaul1/ESP32-audioI2S/

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