Vulnerability in Apache Nimble
CVE-2026-45812
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Apache Nimble
- Apache Software Foundation Nimble — versions 0
Weakness classification (CWE)
References
- github.com/apache/mynewt-nimble/commit/605c7585408bc3674818eeb7b6f478a8aefe9746 (Patch, patch)
- lists.apache.org/thread/rll5m1ly2vg8jr76lp5ohrtspr5vlofy (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-45812?
- CVE-2026-45812 is a medium-severity vulnerability in Apache Nimble, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.5/10. Published 2026-07-24.
- How severe is CVE-2026-45812?
- Medium severity. CVSS v3 base score is 6.5 out of 10.