Apache NimBLE up to 1.9.0 HCI Socket Transport buffer overflow

Summaryinfo

A vulnerability classified as critical was found in Apache NimBLE up to 1.9.0. Affected by this issue is some unknown functionality of the component HCI Socket Transport. Executing a manipulation can lead to buffer overflow. This vulnerability is registered as CVE-2026-45811. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in Apache NimBLE up to 1.9.0 and classified as critical. This vulnerability affects an unknown function of the component HCI Socket Transport. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Apache NimBLE. The HCI socket transport did not check whether a received HCI event would fit the configured event pool before copying it, allowing a buffer overflow. Severity is low: exploitation requires either a misconfigured pool size or a malicious/compromised controller on the other end of the HCI socket link, not over-the-air Bluetooth access. This issue affects Apache NimBLE: through 1.9.0. Users are recommended to upgrade to version 1.10.0, which fixes the issue.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-45811 since 05/13/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/24/2026).

Upgrading to version 1.10.0 eliminates this vulnerability. Applying the patch dcc4e4f026109eecd507de9479bb5019306a4a41 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Apache

Name

• NimBLE

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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