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

Summaryinfo

A vulnerability was found in schreibfaul1 ESP32-audioI2S 3.4.5. It has been rated as critical. Affected by this issue is some unknown functionality of the file src/Audio.cpp. Performing a manipulation results in heap-based overflow. This vulnerability is identified as CVE-2026-51266. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in schreibfaul1 ESP32-audioI2S 3.4.5. It has been classified as critical. This affects an unknown function of the file src/Audio.cpp. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as 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(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the HTTP request header construction logic. The application dynamically splices attacker-controlled host name, path, query string, and multiple HTTP header fields into a fixed ps_ptr heap buffer without proper size limitation and boundary validation. Remote attackers can use an oversized crafted network request parameter to trigger out-of-bounds heap write, leading to arbitrary code execution.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-51266 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. 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.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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

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