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CVE-2026-81507— ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data

Quick assessment

Affected
espressif esp-idf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ESF-IDF 是乐鑫（Espressif）物联网（IoT）开发框架。在版本 5.2.8、5.3.6、5.5.5、6.0.3 及 6.1-rc1 之前，ESP-IDF 中的 BlueDroid L2CAP 配置选项处理逻辑（位于 l2c_main.c 和 l2c_utils.c 文件中）未能一致地验证配置选项长度与剩余接收数据包字节数是否匹配。在此情况下，处于无线电通信范围内的远程未认证 BR/EDR（基础速率/增强数据率）蓝牙对等设备可发送一个构造不良的 L2CAP 配置请求，从而导致越界读取（out-of-bo

CVSS 6.5 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 2 AI

T1043 T1200 · Hardware Additions

Affected Version Matrix 5

VendorProduct Version RangeStatus
espressif esp-idf < 5.2.8 affected
>= 5.3-beta1, < 5.3.6 affected
>= 5.4-beta1, < 5.5.5 affected
>= 6.0-beta1, < 6.0.3 affected
>= 6.1-beta1, < 6.1-rc1 affected
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I. Basic Information for CVE-2026-81507

Vulnerability Information
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Vulnerability Title
ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
espressif esp-idf < 5.2.8 -

II. Public POCs for CVE-2026-81507

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III. Intelligence Information for CVE-2026-81507

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Patches & Fixes for CVE-2026-81507 (8)

Vendor Pages for CVE-2026-81507 (4)

IV. Related Vulnerabilities

Same product: esp-idf
Same vendor: espressif
Same weakness: CWE-125

V. Comments for CVE-2026-81507

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