Out-of-bounds Read in Espressif Esp-Idf
CVE-2026-81508
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (11.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Espressif Esp-Idf — versions = 5.5.5, = 6.0.1, = 6.1
Weakness classification (CWE)
References
- https://github.com/espressif/esp-idf/security/advisories/GHSA-xcpr-5mqp-9qvv
- https://github.com/espressif/esp-idf/commit/0d118139ff8b7aa87b656c2f4a6421ecaa1f5939
- https://github.com/espressif/esp-idf/commit/6cb20db4dfeee81314d0c55acb82f3f0e7679abe
- https://github.com/espressif/esp-idf/commit/85d56bcd266117e0fe6a6b75511c8e122fda29ad
- https://github.com/espressif/esp-idf/commit/ca55d63de82e41e2c672bfd2b707fc80911f30ce
Frequently asked questions
- What is CVE-2026-81508?
- CVE-2026-81508 is a medium-severity vulnerability in Espressif Esp-Idf, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2026-09-24.
- How severe is CVE-2026-81508?
- Medium severity. CVSS v3 base score is 4.3 out of 10.