CVE-2026-40454
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedOut-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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe Apache IoTDB C++ client contains an out-of-bounds read vulnerability in its TsBlock deserializer due to improper input validation. When the client receives malformed data from the server, the deserializer reads memory beyond allocated buffer boundaries, causing the client process to crash.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Apache IoTDB C++ client library versionLocate the IoTDB client library file (typically libiotdbcpp.so on Linux or iotdbcpp.dll on Windows) and query its version using 'strings libiotdbcpp.so | grep -i version' or check the file properties. Alternatively, check your project's dependency management file (CMakeLists.txt, conanfile.txt, or package lock) for the iotdb-cpp-client version.Affected if The installed version is earlier than 2.0.10 in the 2.x branch or earlier than 1.3.8 in the 1.x branch.
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Confirm the application uses the C++ client to query dataReview your application code to verify it instantiates and uses the IoTDB C++ client (Session, SessionPool, or Connection class) to send queries or receive data from the IoTDB server.Affected if The application uses the C++ client library to communicate with an IoTDB server.
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Check for client crash logs or core dumpsSearch server and application logs for segmentation faults, memory access violations, or abrupt client process terminations, especially after query operations. On Linux, check for core dumps in the working directory or configured core dump location.Affected if The client process has crashed with memory-related errors during or after data retrieval operations.
You are affected if your Apache IoTDB C++ client version is below 2.0.10 (2.x branch) or below 1.3.8 (1.x branch) and your application uses the C++ client to receive data from the server.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade the Apache IoTDB C++ client library to version 2.0.10 (or 1.3.8 for the 1.x branch) to resolve the vulnerability.
2.0.10
- Upgrade Apache IoTDB C++ client from any version before 2.0.10 to version 2.0.10 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-40454 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-40454 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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