schreibfaul1 ESP32-audioI2S 3.4.5 src/Audio.cpp AudioBuffer::freeSpace race condition

Summaryinfo

A vulnerability classified as critical has been found in schreibfaul1 ESP32-audioI2S 3.4.5. This issue affects the function AudioBuffer::freeSpace of the file src/Audio.cpp. This manipulation causes race condition. This vulnerability appears as CVE-2026-51261. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in schreibfaul1 ESP32-audioI2S 3.4.5. It has been declared as critical. Affected by this vulnerability is the function AudioBuffer::freeSpace of the file src/Audio.cpp. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Missing mutex synchronization in AudioBuffer::freeSpace() in schreibfaul1 ESP32-audioI2S 3.4.5 creates a race condition between concurrent tasks. The function calculates available buffer space without protecting shared read/write pointers, returning an incorrectly large value. Trusting this value leads to heap out-of-bounds write, memory corruption, device crash, and arbitrary code execution.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-51261 since 06/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

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/

CPE 2.3info

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CPE 2.2info

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