EUVD-2026-49860
GHSA-6472-64ch-7p8m
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-accessible vulnerable audio library with no auth or user interaction; heap overflow can lead to full compromise.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Unchecked unsigned integer overflow in buffer size calculation in schreibfaul1 ESP32-audioI2S 3.4.5 leads to undersized PSRAM buffer allocation. Subsequent normal audio buffer read and write operations cause heap out-of-bounds access, memory corruption, denial of service, and potential code execution.
AnalysisAI
Heap-based buffer overflow in schreibfaul1 ESP32-audioI2S library version 3.4.5 allows remote unauthenticated attackers to corrupt PSRAM memory, leading to denial of service and potential arbitrary code execution. An unchecked unsigned integer overflow when allocating a buffer for audio processing results in an undersized allocation; subsequent read/write operations overrun the heap. A proof-of-concept exploit is publicly available, but the vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog.
Technical ContextAI
The vulnerability resides in the Audio.cpp file of the ESP32-audioI2S library, an Arduino component used for I2S audio output on ESP32 microcontrollers. The underlying technology involves PSRAM buffer allocation during audio stream processing, where an unchecked unsigned integer overflow (CWE-122 Heap-based Buffer Overflow) leads to an undersized allocation. The CPE string is generic (cpe:2.3:a:n/a:n/a:*:*:*:*:*:*:*:*), but the affected product is specifically the ESP32-audioI2S library version 3.4.5. This library is commonly used in IoT devices for streaming internet radio or other audio content over Wi-Fi, directly aligning with the network-based attack vector.
RemediationAI
No vendor-released patch is available at the time of this analysis. Users should monitor the official GitHub repository for a fix. As a workaround, restrict network access to the device's audio streaming services or disable processing of untrusted audio sources. Developers can fork the library and implement input validation on buffer size calculations to prevent the integer overflow. Note that disabling audio streaming functionality may break intended device functionality, and manual patching requires careful integration.
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Same weakness CWE-122 – Heap-based Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today