---
title: "CVE-2026-87961: ESP32-audioI2S - Out of Bounds Read"
description: "ESP32-audioI2S 3.4.4 through 4.0.0 contains a heap-based out-of-bounds read caused by a shadowed length parameter in ID3 synchronized-lyrics processing in read_ID3_Header, letting attackers craft malicious MP3 files or HTTP audio streams to cause crashes or expose adjacent heap memory, exploit requires crafted audio input."
url: https://panop.io/threat-heartbeat/CVE-2026-87961/
---

# CVE-2026-87961 ESP32-audioI2S - Out of Bounds Read

ESP32-audioI2S 3.4.4 through 4.0.0 contains a heap-based out-of-bounds read caused by a shadowed length parameter in ID3 synchronized-lyrics processing in read\_ID3\_Header, letting attackers craft malicious MP3 files or HTTP audio streams to cause crashes or expose adjacent heap memory, exploit requires crafted audio input.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.47% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87961)

## Details

Type

Out of Bounds Read

Impact

Denial Of Service, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Published

10 September 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to version 4.0.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87961](https://nvd.nist.gov/vuln/detail/CVE-2026-87961)
- [https://github.com/schreibfaul1/ESP32-audioI2S/issues/1380](https://github.com/schreibfaul1/ESP32-audioI2S/issues/1380)
- [https://github.com/schreibfaul1/ESP32-audioI2S/pull/1381](https://github.com/schreibfaul1/ESP32-audioI2S/pull/1381)
- [https://www.vulncheck.com/advisories/esp32-audioi2s-3.4.4-through-4.0.0-heap-based-out-of-bounds-read-via-shadowed-length-parameter-in-read-id3-header](https://www.vulncheck.com/advisories/esp32-audioi2s-3.4.4-through-4.0.0-heap-based-out-of-bounds-read-via-shadowed-length-parameter-in-read-id3-header)
- [https://github.com/schreibfaul1/ESP32-audioI2S](https://github.com/schreibfaul1/ESP32-audioI2S)
- [https://github.com/schreibfaul1/ESP32-audioI2S/blob/490ff729eca344f06581f3e9bda9cfba948fd5a1/src/Audio.cpp#L2526-L2531](https://github.com/schreibfaul1/ESP32-audioI2S/blob/490ff729eca344f06581f3e9bda9cfba948fd5a1/src/Audio.cpp#L2526-L2531)
- [https://github.com/schreibfaul1/ESP32-audioI2S/blob/490ff729eca344f06581f3e9bda9cfba948fd5a1/src/Audio.cpp#L2629-L2635](https://github.com/schreibfaul1/ESP32-audioI2S/blob/490ff729eca344f06581f3e9bda9cfba948fd5a1/src/Audio.cpp#L2629-L2635)
- [https://github.com/schreibfaul1/ESP32-audioI2S/blob/f01ad7923dcf3355eeca7fb99bf8a4d9945e7478/src/Audio.cpp#L2270-L2276](https://github.com/schreibfaul1/ESP32-audioI2S/blob/f01ad7923dcf3355eeca7fb99bf8a4d9945e7478/src/Audio.cpp#L2270-L2276)
- [https://github.com/schreibfaul1/ESP32-audioI2S/commit/4dc4614b9dab2de7b342d682b1c18b109d75b677](https://github.com/schreibfaul1/ESP32-audioI2S/commit/4dc4614b9dab2de7b342d682b1c18b109d75b677)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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