CVE-2026-40454: Apache Software Foundation Apache Iotdb C++ Client

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Out-of-bounds Read, Improper Input Validation vulnerability in Apache IoTDB C++ client. Out-of-bounds reads in IoTDB C++ client TsBlock deserializer crash client process on malformed server data. This issue affects Apache IoTDB C++ client: from 1.3.5 before 1.3.8, from 2.0.5 before 2.0.10. Users are recommended to upgrade to version 2.0.10, which fixes the issue.

Affected products

• Apache Software Foundation Apache Iotdb C++ Client: from 1.3.5, before 1.3.8 (fixed in 1.3.8); from 2.0.5, before 2.0.10 (fixed in 2.0.10)

Published 2026-07-10. Last modified 2026-07-10.