Protected GATT value disclosure via wrong permission check
Published Aug 1, 2026 · Updated Aug 1, 2026
Incorrect authorization in Zephyr RTOS 2.6.0 through 4.4.1 allows physically proximate attackers to read protected GATT values via BLE notifications. When an application passes a Characteristic Declaration to the notify or indicate API, the Bluetooth host checks its fixed read permission instead of the following value attribute's encryption, authentication, or LESC requirements. Exposure requires a notify- or indicate-enabled characteristic with stronger value permissions than its writable CCC, and is limited to disclosure over an undersecured link.
Summary
What happened
Incorrect authorization in Zephyr RTOS 2.6.0 through 4.4.1 allows physically proximate attackers to read protected GATT values via BLE notifications. When an application passes a Characteristic Declaration to the notify or indicate API, the Bluetooth host checks its fixed read permission instead of the following value attribute's encryption, authentication, or LESC requirements. Exposure requires a notify- or indicate-enabled characteristic with stronger value permissions than its writable CCC, and is limited to disclosure over an undersecured link.
The record
- CVE
- CVE-2026-2411
- Published
- Aug 1, 2026
- Updated
- Aug 1, 2026
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-863
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 1, 2026CVE publishedPublication date reported by the CVE source.
- Aug 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.6.0 <4.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-4w3r-v9q9-4462 reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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