Quick answers
- Is CVE-2026-51251 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-51251 being exploited in the wild.
- How severe is CVE-2026-51251?
- 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-2026-51251?
- 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-2026-51251 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-51251?
- 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 Schreibfaul1 ESP32-audioI2S version 3.4.5 within the MP3Decoder::decode() function. The vulnerability is caused by a lack of bounds checking on the 'mainDataBegin' and 'nSlots' values extracted from MP3 frame headers. These untrusted values are used directly in memmove and memcpy operations targeting the fixed-size 'mainBuf' heap buffer. An attacker can provide a crafted MP3 file or stream to trigger out-of-bounds writes, leading to a denial of service (watchdog crash) or potential remote code execution on the ESP32 hardware. No official 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