CVE-2026-40454: Apache IoTDB C++ client: Out-of-bounds reads in C++ client TsBlock deserializer crash client process on malformed server data

[Haonan Hou <haonan () apache org>]

Severity: moderate 

Affected versions:

- Apache IoTDB C++ client (client-cpp) 1.3.5 before 1.3.8
- Apache IoTDB C++ client (client-cpp) 2.0.5 before 2.0.10

Description:

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.

Credit:

bugbunny.ai (finder)

References:

https://iotdb.apache.org
https://www.cve.org/CVERecord?id=CVE-2026-40454