---
title: "CVE-2026-19570: Zephyr Bluetooth LE Audio Broadcast Sink - Buffer Overflow"
description: "Zephyr Bluetooth LE Audio Broadcast Sink contains a buffer overflow caused by lack of bounds checking when copying subgroup metadata from Basic Audio Announcement (BASE), letting remote attackers in radio range cause memory corruption and potential remote code execution, exploit requires attacker to be in radio range and send crafted BASE data."
url: https://panop.io/threat-heartbeat/CVE-2026-19570/
---

# CVE-2026-19570 Zephyr Bluetooth LE Audio Broadcast Sink - Buffer Overflow

Zephyr Bluetooth LE Audio Broadcast Sink contains a buffer overflow caused by lack of bounds checking when copying subgroup metadata from Basic Audio Announcement (BASE), letting remote attackers in radio range cause memory corruption and potential remote code execution, exploit requires attacker to be in radio range and send crafted BASE data.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.29% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19570)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Information Disclosure

CVSS vector

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

Published

9 October 2026

Updated

15 October 2026

Weakness

[CWE-120](https://cwe.mitre.org/data/definitions/120.html)

## Vendor fix

Update to the latest Zephyr version containing the fix that rejects oversized BASE subgroups and clamps metadata copying.

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-2026-19570](https://nvd.nist.gov/vuln/detail/CVE-2026-19570)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4qwc-2qfq-w2fj](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4qwc-2qfq-w2fj)
- [https://github.com/zephyrproject-rtos/zephyr/commit/5738f61f4128bb38508bab57342b1f7bf218d127](https://github.com/zephyrproject-rtos/zephyr/commit/5738f61f4128bb38508bab57342b1f7bf218d127)

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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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