CVE-2026-81508 json
ESF-IDF: Heap Out-of-Bounds Read in Bluedroid A2DP Sink Media Packet Processing
published 2mo ago modified last mo. also EUVD-2026-86334 , GHSA-xcpr-5mqp-9qvv
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository espressif/esp-idf. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- espressif esp-idf 6.0.2
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected products
- espressif esp-idf
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
- github.com /espressif/esp-idf/commit/0d118139ff8b7aa87b656c2f4a6421ecaa1f5939
- github.com /espressif/esp-idf/commit/6cb20db4dfeee81314d0c55acb82f3f0e7679abe
- github.com /espressif/esp-idf/commit/85d56bcd266117e0fe6a6b75511c8e122fda29ad
- github.com /espressif/esp-idf/commit/ca55d63de82e41e2c672bfd2b707fc80911f30ce
-
github.com
/espressif/esp-idf/security/advisories/GHSA-xcpr-5mqp-9qvv
advisory
Sources
- CVE List CVE-2026-81508
- NVD CVE-2026-81508
- Maintainer advisory GHSA-xcpr-5mqp-9qvv
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of espressif/esp-idf published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.