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CVE-2026-45542— ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth

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.

ESP-IDF是Espressif开源的一个 Windows、Linux 和 macOS 上支持的 Espressif SoC 的开发框架。 ESP-IDF 5.2.6版本、5.3.5版本、5.4.4版本、5.5.4版本和6.0版本存在安全漏洞，该漏洞源于protocomm组件中安全方案2会话设置路径的堆缓冲区溢出，第一阶段处理程序信任客户端提供的protobuf字段长度并将其复制到从较窄目标类型派生的缓冲区中，导致截断与复制不对称，当提供过大值时破坏堆。

CVSS 7.1 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 5

VendorProduct Version RangeStatus
espressif esp-idf = 5.2.6 affected
= 5.3.5 affected
= 5.4.4 affected
= 5.5.4 affected
= 6.0 affected
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I. Basic Information for CVE-2026-45542

Vulnerability Information
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Vulnerability Title
ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth
Source: CVE Program / CVE List V5
Vulnerability Description
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
ESP-IDF 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ESP-IDF是Espressif开源的一个 Windows、Linux 和 macOS 上支持的 Espressif SoC 的开发框架。 ESP-IDF 5.2.6版本、5.3.5版本、5.4.4版本、5.5.4版本和6.0版本存在安全漏洞，该漏洞源于protocomm组件中安全方案2会话设置路径的堆缓冲区溢出，第一阶段处理程序信任客户端提供的protobuf字段长度并将其复制到从较窄目标类型派生的缓冲区中，导致截断与复制不对称，当提供过大值时破坏堆。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
espressif esp-idf = 5.2.6 -

II. Public POCs for CVE-2026-45542

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III. Intelligence Information for CVE-2026-45542

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Vendor Advisories for CVE-2026-45542 (1)

Same Patch Batch · espressif · 2026-06-10 · 6 CVEs total

CVE-2026-45328 9.3 CRITICAL ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers
CVE-2026-45541 7.5 HIGH ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
CVE-2026-45329 7.1 HIGH ESF-IDF: Out-of-Bounds Read in ESP-TEE Secure Service Wrappers
CVE-2026-45160 6.5 MEDIUM ESF-IDF: Out-of-bounds Read in lwIP DHCP Server Option Parser
CVE-2026-46532 4.6 MEDIUM ESF-IDF: Heap Out-of-Bounds Read in Bluedroid AVRCP Target Parser

IV. Related Vulnerabilities

Same product: esp-idf
Same vendor: espressif
Same weakness: CWE-122

V. Comments for CVE-2026-45542

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