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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-20

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.

Affected products

• Apache Software Foundation Apache IoTDB C++ client: from 1.3.5 before 1.3.8; from 2.0.5 before 2.0.10 — fixed in 1.3.8, 2.0.10

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache IoTDB C++ client 1.3.8, 2.0.10. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/9wml325g6bpovw0jf5ymtc3xl7fwlkrn
• http://www.openwall.com/lists/oss-security/2026/07/10/8

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