How severe is CVE-2023-51656?

CVE-2023-51656 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-51656?

CVE-2023-51656 affects the following packages: org.apache.iotdb:iotdb-parent (Maven). Ecosystems affected: Maven.

How do I fix CVE-2023-51656?

Update org.apache.iotdb:iotdb-parent to 1.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-51656 is resolved across your whole dependency graph.

How do I detect CVE-2023-51656 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.iotdb:iotdb-parent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2023-51656 if there is no patch (or I can't update yet)?

Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Is CVE-2023-51656 actively exploited in the wild?

No public exploit code has been indexed for CVE-2023-51656 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2023-51656?

CVE-2023-51656 has an EPSS (Exploit Prediction Scoring System) score of 1.0%, placing it in the 64th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2023-51656?

CVE-2023-51656 is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2023-51656 published, and has it been updated?

CVE-2023-51656 was published on December 21, 2023 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

CRITICAL severity

CVE-2023-51656 — iotdb-parent

CRITICAL

CVE-2023-51656 is a critical-severity (CVSS 9.8) Deserialization of Untrusted Data vulnerability in org.apache.iotdb:iotdb-parent. A fix is available for org.apache.iotdb:iotdb-parent — see the affected versions and patch details below.

Apache IoTDB: Unsafe deserialize map in Sync Tool

Also known asGHSA-f23h-52hj-99p6

Published

Dec 21, 2023

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

☕org.apache.iotdb:iotdb-parent

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Deserialization of Untrusted Data vulnerability in Apache IoTDB.This issue affects Apache IoTDB: from 0.13.0 through 0.13.4.

Users are recommended to upgrade to version 1.2.2, which fixes the issue.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.iotdb:iotdb-parent`	≥ 0.13.0&&< 1.2.2	1.2.2`org.apache.iotdb:iotdb-parent:1.2.2`

Affected Products

1 product · 1 configurations

Application

iotdbapache

≥ 0.13.0 && ≤ 0.13.4

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.iotdb:iotdb-parent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.iotdb:iotdb-parent to 1.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-51656 is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

Deserialization of Untrusted Data vulnerability in Apache IoTDB.This issue affects Apache IoTDB: from 0.13.0 through 0.13.4. Users are recommended to upgrade to version 1.2.2, which fixes the issue.

O3 Security · Impact-Aware SCA

Is CVE-2023-51656 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

9.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE Classification

CWE-502Deserialization of Untrusted Data

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

iotdb

5.5/10

Code-Review9/10

Maintained10/10

Branch-Protection0/10

Assessed Nov 2, 2026

Timeline

Disclosed

Dec 21, 2023

Last updated

Oct 28, 2026

Identifiers

CVE-2023-51656

GHSA-f23h-52hj-99p6

References

Advisorygithub.com · CVE 2023 51656.json Advisorylists.apache.org · zy3klwpv11vl5n65josbfo2fyzxg3dxc Advisorynvd.nist.gov · CVE 2023 51656 Webopenwall.com Packagegithub.com · iotdb

Related vulnerabilities

Also affects iotdb-parent

This CVE is critical severity — higher than any of the other 1 CVE affecting iotdb-parent (highest there: high).

CVE-2020-1952

Same weakness: CWE-502

This CVE is critical severity; 1 of 7 other CVEs with CWE-502 is rated as high or higher (top: critical).

CVE-2026-115878CVE-2026-62848CVE-2026-115912CVE-2026-116580CVE-2026-114608CVE-2026-102554GHSA-673q-mjm6-r5xrBrowse all CWE-502

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026

CVE-2023-51656 — iotdb-parent

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2023-51656 in your dependencies?