CVE-2026-81508
Received Received - Intake

Bluetooth A2DP Sink Heap Memory Disclosure in ESP-IDF

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: GitHub, Inc.

Description
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In 5.5.5, 6.0.1, and 6.1, the BlueDroid A2DP sink function btc_a2dp_sink_handle_inc_media() reads a timestamp field from the received media buffer before validating that the packet layout contains the field. A paired BR/EDR audio source within radio range can send a malformed A2DP media packet to a build with BlueDroid Classic Bluetooth and A2DP sink support enabled, causing an out-of-bounds read into adjacent heap memory and limited disclosure of heap contents. Arbitrary memory disclosure and code execution are not established.

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-81508
EUVD
EUVD-2026-86334

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
espressif esf-idf 5.5.5
espressif esf-idf 6.0.1
espressif esf-idf 6.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This vulnerability exists in the Espressif IoT Development Framework (ESP-IDF) versions 5.5.5, 6.0.1, and 6.1. It involves the BlueDroid A2DP sink function reading a timestamp from a media buffer before verifying the packet layout. A nearby malicious Bluetooth audio source can send a malformed packet, causing an out-of-bounds read into adjacent heap memory and limited disclosure of heap contents.

Detection Guidance

Detection requires monitoring for malformed A2DP media packets on Bluetooth interfaces. Use tools like hcidump or btmon to capture Bluetooth traffic and inspect for irregular packet structures. Check for unexpected heap memory disclosures in system logs or memory dumps. Ensure BlueDroid Classic Bluetooth and A2DP sink support are disabled if not needed.

Impact Analysis

If you use ESP-IDF with BlueDroid Classic Bluetooth and A2DP sink support enabled, an attacker within Bluetooth range could exploit this to read limited heap memory contents. This may expose sensitive data in memory but does not allow arbitrary code execution or full memory disclosure.

Compliance Impact

This vulnerability could potentially lead to unauthorized disclosure of sensitive data in memory, which may violate GDPR (data protection) or HIPAA (health information privacy) if such data is exposed. However, the impact is limited to heap memory disclosure and does not confirm full data exfiltration.

Mitigation Strategies

Upgrade ESF-IDF to versions 5.5.5, 6.0.1, or 6.1 or later. Disable BlueDroid Classic Bluetooth and A2DP sink support if not required. Apply Bluetooth stack patches from Espressif. Monitor for suspicious Bluetooth traffic and restrict unauthorized Bluetooth device connections.

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