Is CVE-2026-51274 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-51274 being exploited in the wild.

How severe is CVE-2026-51274?

Informational severity, with a CVSS score of 0, published 28 July 2026.

Which products and versions are affected?

Schreibfaul1 ESP32-audioI2S 3.4.5.

Is there a fix for CVE-2026-51274?

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-2026-51274 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-51274?

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-2026-51274: schreibfaul1 ESP32-audioI2S heap overflow in SYLT parser

CVE-2026-51274 · Severity: info · CVSS 0 · Published 2026-07-28

A vulnerability exists in the ESP32-audioI2S library, which is used by ESP32-based hardware to play audio files. By providing a specially crafted MP3 file, an attacker can cause the device to crash, leak internal memory data, or potentially take control of the device. This could lead to a permanent loss of audio functionality until the device is manually restarted or allow unauthorized access to data stored on the hardware.

Technologies: Schreibfaul1 ESP32-audioI2S. Vendors: Schreibfaul1.

Quick answers

Is CVE-2026-51274 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-51274 being exploited in the wild.
How severe is CVE-2026-51274?: Informational severity, with a CVSS score of 0, published 28 July 2026.
Which products and versions are affected?: Schreibfaul1 ESP32-audioI2S 3.4.5.
Is there a fix for CVE-2026-51274?: 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-2026-51274 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-51274?: 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 exists in the Audio::read_MP3_Header() function within src/Audio.cpp of the ESP32-audioI2S library. The vulnerability is caused by a lack of bounds validation on the framesize integer extracted from the SYLT (Synchronized Lyrics) frame header in ID3v2 metadata. An attacker can provide an MP3 file with an oversized framesize value, leading to an undersized heap allocation (syltBuff) followed by out-of-bounds read and write operations during the lyric parsing loop. This can result in PSRAM corruption, device reboots via watchdog timer, or potential arbitrary code execution. As of the advisory, a vendor patch is reportedly under development.

Affected products

schreibfaul1 ESP32-audioI2S 3.4.5

Timeline

2026-07-28: disclosed: CVE-2026-51274 published

References

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