Is CVE-2026-45811 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-45811 being exploited in the wild.

How severe is CVE-2026-45811?

Informational severity, with a CVSS score of 3.1, published 24 July 2026.

Which products and versions are affected?

Apache Software Foundation NimBLE through 1.9.0.

Is there a fix for CVE-2026-45811?

A patch was published on 2026-07-24: Fix committed to mynewt-nimble repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-45811 attacked?

It is attacked from the adjacent network, in a software library.

Am I affected by CVE-2026-45811?

Check whether you run Apache Software Foundation NimBLE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-45811: Apache NimBLE buffer overflow in HCI socket transport

CVE-2026-45811 · Severity: info · CVSS 3.1 · Published 2026-07-24

Apache NimBLE is an open-source Bluetooth Low Energy stack. A flaw in how it handles communication with Bluetooth hardware controllers could allow a compromised or malicious controller to crash the system by sending oversized data packets. This issue does not allow for remote attacks over-the-air; it requires physical or local access to the hardware interface.

Technologies: Apache Software Foundation NimBLE. Vendors: Apache Software Foundation.

Quick answers

Is CVE-2026-45811 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-45811 being exploited in the wild.
How severe is CVE-2026-45811?: Informational severity, with a CVSS score of 3.1, published 24 July 2026.
Which products and versions are affected?: Apache Software Foundation NimBLE through 1.9.0.
Is there a fix for CVE-2026-45811?: A patch was published on 2026-07-24: Fix committed to mynewt-nimble repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-45811 attacked?: It is attacked from the adjacent network, in a software library.
Am I affected by CVE-2026-45811?: Check whether you run Apache Software Foundation NimBLE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A 'Classic Buffer Overflow' (CWE-120) exists in the HCI socket transport component of Apache NimBLE. The vulnerability is caused by a failure to validate that a received Host Controller Interface (HCI) event fits within the configured event pool before performing a copy operation. An attacker with control over the Bluetooth controller (the hardware/firmware on the other end of the HCI socket) can send an oversized event to trigger the overflow. This cannot be exploited over-the-air via Bluetooth. The issue is fixed in version 1.10.0 by dropping HCI events that exceed the BLE_TRANSPORT_EVT_SIZE configuration.

Affected products

Apache Software Foundation Apache NimBLE through 1.9.0

Timeline

2026-07-24: advisory: CVE-2026-45811 published by Apache Software Foundation
2026-07-24: patched: Fix committed to mynewt-nimble repository

References

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