Quick answers
- Is CVE-2026-51267 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-51267 being exploited in the wild.
- How severe is CVE-2026-51267?
- Informational severity, with a CVSS score of 8.1, published 28 July 2026.
- Which products and versions are affected?
- Schreibfaul1 ESP32-audioI2S 3.4.5.
- Is there a fix for CVE-2026-51267?
- 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-2026-51267 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-51267?
- 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. The vulnerability is caused by the application concatenating untrusted extension paths and attacker-controlled query strings into a fixed-size ps_ptr heap buffer without validating the final string length. When the urlencode function is subsequently invoked, the resulting expanded string can exceed the buffer's capacity, leading to an out-of-bounds write on ESP32 PSRAM. A remote, unauthenticated attacker can exploit this by inducing the device to connect to a malicious audio stream URL, potentially resulting in arbitrary code execution, memory corruption, or a device crash (watchdog reboot). As of the advisory date, a vendor patch is reportedly under development.
Affected products
- schreibfaul1 ESP32-audioI2S 3.4.5
Timeline
- 2026-07-28: advisory: CVE-2026-51267 published by NVD/MITRE
- 2026-07-28: disclosed: Vulnerability details shared on GitHub by researcher