SB2026051362 - Multiple vulnerabilities in ESP-IDF

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Main Vulnerability Database SB2026051362

SB2026051362 - Multiple vulnerabilities in ESP-IDF

Published: May 13, 2026 Updated: May 18, 2026

Security Bulletin ID SB2026051362
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Out-of-bounds read (CVE-ID: CVE-2026-45329)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in ESP-TEE secure-service wrappers in esp_secure_services.c and esp_secure_services_iram.c when processing caller-supplied pointer arguments. A remote attacker can supply pointers into TEE-exclusive memory to disclose sensitive information.

The issue crosses the REE/TEE isolation boundary and can expose TEE code and data, including cryptographic keys, through repeated calls that may return raw bytes, derived results, or oracle-like disclosure.


2) Out-of-bounds write (CVE-ID: CVE-2026-45328)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to out-of-bounds write in secure-service wrappers in esp_secure_services.c and esp_secure_services_iram.c when processing caller-supplied pointer arguments for secure service calls. A remote attacker can supply crafted pointers that target TEE-resident memory to execute arbitrary code.

Exploitation requires local code execution in the REE and can break the REE/TEE isolation boundary.


3) NULL pointer dereference (CVE-ID: CVE-2026-45541)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to null pointer dereference in httpd_ws_get_response_subprotocol() in the esp_http_server component when parsing the client-supplied Sec-WebSocket-Protocol header during the WebSocket handshake. A remote attacker can send a malformed header value to cause a denial of service.

The issue is reachable only when WebSocket support is enabled and at least one registered WebSocket URI handler performs subprotocol negotiation by supplying a non-NULL supported_subprotocol.


4) Heap-based buffer overflow (CVE-ID: CVE-2026-45542)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to heap-based buffer overflow in handle_session_command0() in components/protocomm/src/security/security2.c when processing a client-supplied SRP6a username field during Security Scheme 2 session setup over Bluetooth Low Energy. A remote attacker can send an oversized protobuf username field to cause a denial of service.

The issue is reachable before any SRP6a credential check and affects only the NimBLE BLE transport with Security Scheme 2 enabled.


Remediation

Install update from vendor's website.

References