Quick answers
- Is CVE-2026-51266 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-51266 being exploited in the wild.
- How severe is CVE-2026-51266?
- 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-2026-51266?
- 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-2026-51266 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-51266?
- 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::connecttohost() function within src/Audio.cpp of the ESP32-audioI2S library. The vulnerability is caused by the uncontrolled concatenation of attacker-supplied strings (host, path, query, User-Agent, and icy metadata) into a fixed-size heap buffer (ps_ptr) using append() and appendf() without boundary checks. A remote attacker can trigger this overflow by providing an oversized URL or network request parameters. This results in an out-of-bounds write that can cause a denial of service (watchdog crash) or remote code execution via heap metadata corruption. As of the advisory, a vendor patch is reportedly in development.
Affected products
- schreibfaul1 ESP32-audioI2S 3.4.5
Timeline
- 2026-07-28: disclosed: CVE-2026-51266 published
- 2026-07-28: advisory: Detailed advisory published on GitHub by researcher