# CVE-2026-51275: schreibfaul1 ESP32-audioI2S heap buffer overflow in ID3v2 APIC parsing

Source: https://junglewise.ai/threats/cve-2026-51275-schreibfaul1-esp32-audioi2s-heap-buffer-overflow-in-id3v2-apic  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-28. Updated: 2026-07-28  
License: CC BY 4.0 with a link back

CVE-2026-51275 · Severity: info · CVSS 0 · Published 2026-07-28

A vulnerability exists in the ESP32-audioI2S library, which is used by ESP32-based devices to play audio files. By providing a specially crafted MP3 file, an attacker can cause the device to crash or potentially execute unauthorized code. This could lead to service disruptions or unauthorized access to the device's memory and data.

Technologies: [Schreibfaul1 ESP32-audioI2S](https://junglewise.ai/threats/technologies/esp32-audioi2s). Vendors: [Schreibfaul1](https://junglewise.ai/threats/vendors/schreibfaul1).

## Quick answers

**Is CVE-2026-51275 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-51275 being exploited in the wild.

**How severe is CVE-2026-51275?** 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-2026-51275?** 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-2026-51275 attacked?** It is attacked over the network or with local access, in a software library.

**Am I affected by CVE-2026-51275?** 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 `Audio::read_MP3_Header()` function within `src/Audio.cpp`. The vulnerability is caused by a lack of length validation when parsing ID3v2 APIC (attached picture) metadata frames. An attacker can provide a malicious MP3 file with an oversized APIC frame size value, leading to an out-of-bounds write into the fixed-size `m_ID3Hdr.iBuff` heap buffer. This can result in PSRAM heap metadata corruption, leading to a device crash (watchdog reset) or potential remote code execution. As of the advisory date, a fix is reportedly under development.

## Affected products

- schreibfaul1 ESP32-audioI2S 3.4.5

## Timeline

- 2026-07-28: advisory: CVE-2026-51275 published

## References

- [https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51275](https://github.com/programmervuln/cveadvisory-/blob/main/CVE-2026-51275)
- [https://github.com/schreibfaul1/ESP32-audioI2S/blob/master/src/Audio.cpp](https://github.com/schreibfaul1/ESP32-audioI2S/blob/master/src/Audio.cpp)

## Related threats

- [ESP32-audioI2S heap out-of-bounds read in ID3 header processing](https://junglewise.ai/threats/cve-2026-87961-esp32-audioi2s-heap-out-of-bounds-read-in-id3-header-processing)
- [schreibfaul1 ESP32-audioI2S heap overflow in latinToUTF8](https://junglewise.ai/threats/cve-2026-51272-schreibfaul1-esp32-audioi2s-heap-overflow-in-latintoutf8)
- [schreibfaul1 ESP32-audioI2S heap overflow in SYLT parser](https://junglewise.ai/threats/cve-2026-51274-schreibfaul1-esp32-audioi2s-heap-overflow-in-sylt-parser)
- [schreibfaul1 ESP32-audioI2S heap overflow in showID3Tag](https://junglewise.ai/threats/cve-2026-51273-schreibfaul1-esp32-audioi2s-heap-overflow-in-showid3tag)
- [schreibfaul1 ESP32-audioI2S heap buffer overflow in read_WAV_Header](https://junglewise.ai/threats/cve-2026-51271-schreibfaul1-esp32-audioi2s-heap-buffer-overflow-in-read-wav)