---
id: CVE-2026-81507
title: ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
summary: >-
  ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Prior
  to 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1, ESP-IDF BlueDroid L2CAP
  configuration-option processing in l2c_main.c and l2c_utils.c does not
  consistently valida…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-125
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T16:17:23.447'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81507'
references:
  - url: >-
      https://github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6fe
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4a
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442a
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749
    label: security-advisories@github.com
  - url: 'https://github.com/espressif/esp-idf/releases/tag/v5.2.8'
    label: security-advisories@github.com
  - url: 'https://github.com/espressif/esp-idf/releases/tag/v5.3.6'
    label: security-advisories@github.com
  - url: 'https://github.com/espressif/esp-idf/releases/tag/v5.5.5'
    label: security-advisories@github.com
  - url: 'https://github.com/espressif/esp-idf/releases/tag/v6.0.3'
    label: security-advisories@github.com
  - url: 'https://github.com/espressif/esp-idf/releases/tag/v6.1-rc1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-13T16:35:46.746Z'
---

## Overview

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Prior to 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1, ESP-IDF BlueDroid L2CAP configuration-option processing in l2c_main.c and l2c_utils.c does not consistently validate option lengths against the remaining received packet bytes. A remote unauthenticated BR/EDR peer within radio range can send a malformed L2CAP configuration request that causes an out-of-bounds read, and under some runtime conditions limited adjacent Bluetooth stack memory can be included in an outbound L2CAP Configuration Response. The issue affects ESP32-class products using the BlueDroid host stack with Classic Bluetooth enabled. This issue is fixed in 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1.

## Remediation

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