CVE-2026-87961: SCHREIBFAUL1 ESP32-AUDIOI2S

High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days.

ESP32-audioI2S versions 3.4.4 through 4.0.0 contain a heap-based out-of-bounds read vulnerability in the read_ID3_Header function due to a shadowed length parameter in ID3 synchronized-lyrics processing. Attackers can craft malicious MP3 files or HTTP audio streams with oversized frame size declarations to read past allocated buffer boundaries, causing device crashes or exposing adjacent heap memory.

Affected products

• SCHREIBFAUL1 ESP32-AUDIOI2S: from 3.4.4, up to and including 4.0.0

Published 2026-09-10. Last modified 2026-09-10.