---
id: CVE-2026-5589
title: >-
  An integer underflow in bt_mesh_sol_recv() in the Bluetooth Mesh solicitation
  handling (subsys/bluetooth/mesh/solicitation.c) leads to an out-of-bounds
  write
summary: >-
  An integer underflow in bt_mesh_sol_recv() in the Bluetooth Mesh solicitation
  handling (subsys/bluetooth/mesh/solicitation.c) leads to an out-of-bounds
  write. When CONFIG_BT_MESH_OD_PRIV_PROXY_SRV is enabled, the function parses
  solicita…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-787
vendor: zephyrproject
product: zephyr
affected:
  - zephyr <= 4.3.0
published: '2026-06-04'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T23:17:37.927'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5589'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4pm9-4v7f-x6gr
    label: vulnerabilities@zephyrproject.org
tags:
  - nvd
  - cve.org
epss: 0.00255
epssPercentile: 0.16961
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-05T18:27:34.569513Z'
ingestedAt: '2026-10-15T22:48:25.577Z'
---

## Overview

An integer underflow in bt_mesh_sol_recv() in the Bluetooth Mesh solicitation handling (subsys/bluetooth/mesh/solicitation.c) leads to an out-of-bounds write. When CONFIG_BT_MESH_OD_PRIV_PROXY_SRV is enabled, the function parses solicitation PDUs from raw BLE advertising payloads. The AD parsing loop reads an attacker-controlled length byte (reported_len) and computes reported_len - 3 without checking that reported_len >= 3. When reported_len is less than 3, the subtraction is performed in signed int arithmetic and yields a negative value that bypasses the length guard and is then implicitly converted to a very large size_t when passed to net_buf_simple_pull_mem(). In builds without assertions, this wraps the buffer length and advances the data pointer far out of bounds, so subsequent reads dereference invalid memory. A nearby BLE device can trigger this with a non-connectable advertisement carrying a UUID16 AD structure and a crafted length byte, with no pairing or prior association required, potentially leading to denial of service or arbitrary code execution.

## Affected

- `zephyr <= 4.3.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.