Is CVE-2026-51252 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-51252 being exploited in the wild.

How severe is CVE-2026-51252?

Informational severity, with a CVSS score of 8.1, published 28 July 2026.

Which products and versions are affected?

Schreibfaul1 ESP32-audioI2S 3.4.5.

Is there a fix for CVE-2026-51252?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-51252 attacked?

It is attacked over the network or with local access, in a software library.

Am I affected by CVE-2026-51252?

Check whether you run Schreibfaul1 ESP32-audioI2S at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-51252: schreibfaul1 ESP32-audioI2S heap buffer overflow in MP3Decoder

CVE-2026-51252 · Severity: info · CVSS 8.1 · Published 2026-07-28

The ESP32-audioI2S library, used to play audio on ESP32 microcontrollers, contains a security flaw in how it processes MP3 files. An attacker can provide a specially crafted MP3 file that, when played, causes the device to crash or potentially allows for unauthorized code execution. This could lead to a permanent freeze of audio services or a complete compromise of the device's operations.

Technologies: Schreibfaul1 ESP32-audioI2S. Vendors: Schreibfaul1.

Quick answers

Is CVE-2026-51252 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-51252 being exploited in the wild.
How severe is CVE-2026-51252?: Informational severity, with a CVSS score of 8.1, published 28 July 2026.
Which products and versions are affected?: Schreibfaul1 ESP32-audioI2S 3.4.5.
Is there a fix for CVE-2026-51252?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-51252 attacked?: It is attacked over the network or with local access, in a software library.
Am I affected by CVE-2026-51252?: Check whether you run Schreibfaul1 ESP32-audioI2S at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow (CWE-122) exists in the UnpackSFMPEG1 function within mp3_decoder.cpp of ESP32-audioI2S v3.4.5. The vulnerability is caused by the use of unvalidated sfCompress, band index, and granule index values retrieved from the MP3 bitstream to index fixed-size scale factor arrays (sfis->s and sfis->l). An attacker can provide a malicious MP3 file with manipulated metadata to trigger out-of-bounds heap writes. This can result in a remote denial of service (watchdog crash) or potentially remote code execution depending on the heap layout. No patch was available at the time of disclosure.

Affected products

schreibfaul1 ESP32-audioI2S 3.4.5

Timeline

2026-07-28: disclosed: Vulnerability disclosed via GitHub and NVD
2026-07-28: advisory

References

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