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CVE-2026-81507

6.5 · MEDIUM

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework.

Published Oct 13, 2026CWE-125EPSS 0.26%

Overview

CVE-2026-81507 is a medium-severity vulnerability. It was published on October 13, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6feGitHubgithub.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4aGitHubgithub.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442aGitHubgithub.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0GitHubgithub.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846GitHubgithub.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834GitHubgithub.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749GitHubgithub.com/espressif/esp-idf/releases/tag/v5.2.8GitHubgithub.com/espressif/esp-idf/releases/tag/v5.3.6GitHubgithub.com/espressif/esp-idf/releases/tag/v5.5.5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-81507?

CVE-2026-81507 is a medium-severity vulnerability. It was published on October 13, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-81507?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-81507?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-81507?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-81507 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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