Quick answers
- Is CVE-2026-51269 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-51269 being exploited in the wild.
- How severe is CVE-2026-51269?
- Informational severity, with a CVSS score of 9.8, published 28 July 2026.
- Which products and versions are affected?
- Schreibfaul1 ESP32-audioI2S 3.4.5.
- Is there a fix for CVE-2026-51269?
- 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-2026-51269 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-51269?
- 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::connecttospeech() function within src/Audio.cpp of the ESP32-audioI2S library. The vulnerability is caused by a lack of input length validation when processing speech text for Text-to-Speech (TTS) requests. The application performs URL encoding on attacker-controlled text, which expands the character count, and then appends the result to a fixed-size heap buffer (ps_ptr) without boundary checks. A remote, unauthenticated attacker can provide a large text payload that triggers an out-of-bounds write in PSRAM. This results in a device crash (Denial of Service) or potential arbitrary code execution due to heap metadata corruption. As of the advisory date, a vendor patch is reported to be in development.
Affected products
- schreibfaul1 ESP32-audioI2S 3.4.5
Timeline
- 2026-07-28: disclosed: CVE-2026-51269 published to NVD