Quick answers
- Is CVE-2026-51273 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-51273 being exploited in the wild.
- How severe is CVE-2026-51273?
- 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-2026-51273?
- 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-2026-51273 attacked?
- It is attacked over the network or with local access, in a software library.
- Am I affected by CVE-2026-51273?
- 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::showID3Tag() function within src/Audio.cpp of the ESP32-audioI2S library. The vulnerability is caused by the use of an unbounded appendf() function to write formatted ID3 tag strings (such as comments, titles, or lyrics) into a fixed-size ps_ptr heap buffer without length validation. An attacker can trigger this by providing a malicious MP3 file or network stream containing oversized ID3v2 tags. This results in out-of-bounds writes that corrupt PSRAM heap metadata, leading to a device crash (watchdog reset) or potential arbitrary code execution. As of the advisory date, a vendor patch is reportedly under development.
Affected products
- schreibfaul1 ESP32-audioI2S 3.4.5
Timeline
- 2026-07-28: disclosed: CVE-2026-51273 published