schreibfaul1 ESP32-audioI2S 3.4.5 src/Audio.cpp AudioBuffer::writeSpace heap-based overflow

Summaryinfo

A vulnerability marked as critical has been reported in schreibfaul1 ESP32-audioI2S 3.4.5. This affects the function AudioBuffer::writeSpace of the file src/Audio.cpp. The manipulation leads to heap-based overflow. This vulnerability is documented as CVE-2026-51260. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in schreibfaul1 ESP32-audioI2S 3.4.5 and classified as critical. This issue affects the function AudioBuffer::writeSpace of the file src/Audio.cpp. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Unsafe fixed-size memcpy operation in AudioBuffer::writeSpace() of schreibfaul1 ESP32-audioI2S 3.4.5 allows remote heap buffer overflow. The code copies a full UINT16_MAX bytes without validating destination available space, causing out-of-bounds memory write.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-51260 since 06/07/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing 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.

Statistical analysis made it clear that VulDB provides the best quality for 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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