EUVD-2026-49867
GHSA-jg85-32w5-7h2c
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
schreibfaul1 ESP32-audioI2S 3.4.5 has a heap-based buffer overflow vulnerability in the connecttospeech() function. The application accepts attacker-controlled long speech text input, performs URL encoding, and directly appends the encoded result into a fixed ps_ptr heap buffer when constructing HTTP TTS request headers. Lack of input length validation and boundary checking allows remote attackers to craft oversized input to trigger out-of-bounds heap write, resulting in arbitrary code execution.
AnalysisAI
Heap-based buffer overflow in the connecttospeech() function of schreibfaul1 ESP32-audioI2S version 3.4.5 allows remote attackers to achieve arbitrary code execution by supplying an overly long speech text string. The flaw arises because the library performs URL encoding of attacker-controlled input and appends it to a fixed-size heap buffer without length validation, leading to a heap overflow. A public proof-of-concept exploit is available, but active exploitation has not been confirmed.
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External POC / Exploit Code
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