Medium6.5Apache Software Foundation

Medium [CVE-2026-45812] Incorrect Calculation of Buffer Size vulnerability in Apache NimBLE when processing Legacy Advertising Report HCI event

This medium-severity Apache Software Foundation advisory covers CVE-2026-45812 affecting Apache NimBLE.

CVE-2026-45812 Published Jul 24, 2026Updated by vendor Jul 27, 2026

CVE-2026-45812

Affected products & platforms

Apache Software FoundationUnclassified

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Summary

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.

Affected versions

through 1.9.0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

1.10.0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

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

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-45812 instead of the raw feed document.
CVE Program

Cross-references

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CVE-2026-45812NVD CVE.org MITRE

Official resources

ASF Security — reporting & CVE process
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Apache project downloads (fixed releases)
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