---
title: "CVE-2026-15894: Zephyr Bluetooth Mesh - Buffer Overflow"
description: "Zephyr Bluetooth Mesh On-Demand Private Proxy (CONFIG_BT_MESH_OD_PRIV_PROXY_SRV enabled) contains a buffer overflow caused by copying an oversized Solicitation PDU into a fixed 17-byte stack buffer without length bounds, letting remote attackers send crafted unauthenticated advertisements to cause stack overwrite, exploit requires attacker to be in radio range."
url: https://panop.io/threat-heartbeat/CVE-2026-15894/
---

# CVE-2026-15894 Zephyr Bluetooth Mesh - Buffer Overflow

Zephyr Bluetooth Mesh On-Demand Private Proxy (CONFIG\_BT\_MESH\_OD\_PRIV\_PROXY\_SRV enabled) contains a buffer overflow caused by copying an oversized Solicitation PDU into a fixed 17-byte stack buffer without length bounds, letting remote attackers send crafted unauthenticated advertisements to cause stack overwrite, exploit requires attacker to be in radio range.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.31% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-15894)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

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

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest Zephyr version with the fix that trims buf->len to 17 octets before decryption.

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-2026-15894](https://nvd.nist.gov/vuln/detail/CVE-2026-15894)
- [https://github.com/zephyrproject-rtos/zephyr/commit/4416ad13677259d180f35ce44338578694e48184](https://github.com/zephyrproject-rtos/zephyr/commit/4416ad13677259d180f35ce44338578694e48184)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-x37p-38wq-cgwj](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-x37p-38wq-cgwj)

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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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