schreibfaul1 ESP32-audioI2S 3.4.5 MP3 Decoder mp3_decoder.cpp MP3Decoder::GetBits nBits integer underflow

Summaryinfo

A vulnerability identified as critical has been detected in schreibfaul1 ESP32-audioI2S 3.4.5. Affected by this vulnerability is the function MP3Decoder::GetBits of the file src/mp3_decoder/mp3_decoder.cpp of the component MP3 Decoder. Performing a manipulation of the argument nBits results in integer underflow. This vulnerability is cataloged as CVE-2026-51254. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in schreibfaul1 ESP32-audioI2S 3.4.5. This affects the function MP3Decoder::GetBits of the file src/mp3_decoder/mp3_decoder.cpp of the component MP3 Decoder. The manipulation of the argument nBits with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

schreibfaul1 ESP32-audioI2S v3.4.5 has an integer underflow vulnerability in the MP3Decoder::GetBits() function of the MP3 decoder due to unchecked bit reading operations. The lack of validation on the nBits parameter causes the cachedBits counter to underflow to negative values, leading to invalid bit manipulation, incorrect bitstream parsing, application crash, or arbitrary code execution via a specially crafted MP3 file.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-51254 since 06/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around 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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• schreibfaul1

Name

• ESP32-audioI2S

Version

• 3.4.5

Website

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

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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