Medium 6.5Published Oct 13, 2026

CVE-2026-81507ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data

Updated under an hour ago (Oct 27, 2026, 11:30 PM ET)

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Every CVE for espressif esp-idf

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

espressif esp-idf espressif:esp_idf (from the name)	before 5.2.8; from 5.3-beta1, < 5.3.6; from 5.4-beta1, < 5.5.5; from 6.0-beta1, < 6.0.3; from 6.1-beta1, < 6.1-rc1	CNA record

References

References

https://github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44	x-refsource-confirm
https://github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6fe	x-refsource-misc
https://github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4a	x-refsource-misc
https://github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442a	x-refsource-misc
https://github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0	x-refsource-misc
https://github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846	x-refsource-misc
https://github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834	x-refsource-misc
https://github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749	x-refsource-misc
https://github.com/espressif/esp-idf/releases/tag/v5.2.8	x-refsource-misc
https://github.com/espressif/esp-idf/releases/tag/v5.3.6	x-refsource-misc
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.