CVE-2026-45812: CWE-131 Incorrect Calculation of Buffer Size in Apache Software Foundation Apache NimBLE
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.
AI Analysis
Technical Summary
CVE-2026-45812 is a buffer size miscalculation vulnerability (CWE-131) in Apache NimBLE through version 1.9.0. When processing Legacy Advertising Report HCI events that bundle multiple reports, NimBLE incorrectly calculates the offset to the next report, leading to potential out-of-bounds reads and delivery of bogus GAP event data to the application. This flaw is only relevant when NimBLE's host is used with third-party controllers that batch multiple reports, as NimBLE's own controller does not do so. The vulnerability is resolved in Apache NimBLE version 1.10.0.
Potential Impact
The vulnerability can cause the host to read past the end of the buffer and deliver corrupted GAP event data to the application. However, the impact is limited because NimBLE's own controller does not batch multiple reports, so exploitation requires pairing with a third-party controller that does. There are no known exploits in the wild. The severity is low.
Mitigation Recommendations
Users should upgrade Apache NimBLE to version 1.10.0 or later, where this buffer size calculation issue is fixed. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor recommendation to upgrade to 1.10.0.
CVE-2026-45812: CWE-131 Incorrect Calculation of Buffer Size in Apache Software Foundation Apache NimBLE
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.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/apache/mynewt-nimbleRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-45812 is a buffer size miscalculation vulnerability (CWE-131) in Apache NimBLE through version 1.9.0. When processing Legacy Advertising Report HCI events that bundle multiple reports, NimBLE incorrectly calculates the offset to the next report, leading to potential out-of-bounds reads and delivery of bogus GAP event data to the application. This flaw is only relevant when NimBLE's host is used with third-party controllers that batch multiple reports, as NimBLE's own controller does not do so. The vulnerability is resolved in Apache NimBLE version 1.10.0.
Potential Impact
The vulnerability can cause the host to read past the end of the buffer and deliver corrupted GAP event data to the application. However, the impact is limited because NimBLE's own controller does not batch multiple reports, so exploitation requires pairing with a third-party controller that does. There are no known exploits in the wild. The severity is low.
Mitigation Recommendations
Users should upgrade Apache NimBLE to version 1.10.0 or later, where this buffer size calculation issue is fixed. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor recommendation to upgrade to 1.10.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-05-13T08:56:54.914Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a63602d9c2644c7f8f15028
Added to database: 07/24/2026, 12:53:01 UTC
Last enriched: 07/24/2026, 13:08:27 UTC
Last updated: 07/25/2026, 03:38:06 UTC
Views: 12
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