schreibfaul1 ESP32-audioI2S 3.4.5 URL Path Concatenation And Encoding src/Audio.cpp heap-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in schreibfaul1 ESP32-audioI2S 3.4.5. This affects an unknown part of the file src/Audio.cpp of the component URL Path Concatenation And Encoding Module. Executing a manipulation can lead to heap-based overflow. This vulnerability is tracked as CVE-2026-51267. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in schreibfaul1 ESP32-audioI2S 3.4.5. It has been declared as critical. This vulnerability affects an unknown functionality of the file src/Audio.cpp of the component URL Path Concatenation And Encoding Module. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the URL path concatenation and encoding module. The application splices untrusted extension path and attacker-controlled query string into a path buffer, then invokes urlencode without validating the final string length. Remote attackers can construct an oversized malicious URL path and query string to trigger out-of-bounds heap write, resulting in arbitrary code execution, information disclosure, service crash, or privilege escalation.

The advisory is available at github.com. This vulnerability was named CVE-2026-51267 since 06/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful 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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