CVE-2026-45812 Apache NimBLE: OOB Read via sizeof(pointer) in Legacy Advertising Report Handler

Medium 6.5 Published 24 Jul 2026 Updated 24 Jul 2026

An out-of-bounds read in Apache NimBLE allows attackers to read memory or cause crashes when using third-party controllers that batch advertising reports.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-45812?

CVE-2026-45812 is a medium-severity memory corruption vulnerability in Apache NimBLE, published on 24 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Incorrect Calculation of Buffer Size vulnerability in Apache NimBLE when processing Legacy Advertising Report HCI event.

When a single HCI advertising report event bundles multiple reports, NimBLE miscalculated the offset to the next report. This can cause the host to read past the end of the buffer and deliver a GAP event with bogus data to the application.

Severity is low: NimBLE's own controller never batches multiple reports into one event, so this only matters when NimBLE's host is paired with a third-party controller that does.

This issue affects Apache NimBLE: through 1.9.0.

Users are recommended to upgrade to version 1.10.0, which fixes the issue.

Weakness: CWE-131

Which versions are affected by CVE-2026-45812?

It affects 1 product.

Products include Apache Nimble.

How do I fix CVE-2026-45812?

No fix has been published for CVE-2026-45812 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-45812 being exploited?

There is no known exploitation of CVE-2026-45812 in the wild and no public exploit code.

Sources

Also known as GHSA-m9xh-wpcw-qvx9.