How severe is CVE-2023-36566?

CVE-2023-36566 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-36566?

CVE-2023-36566 affects the following packages: com.microsoft.commondatamodel:objectmodel (Maven), Microsoft.CommonDataModel.ObjectModel (NuGet), commondatamodel-objectmodel (PyPI). Ecosystems affected: Maven, NuGet, PyPI.

How do I fix CVE-2023-36566?

Update com.microsoft.commondatamodel:objectmodel to 1.7.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-36566 is resolved across your whole dependency graph.

How do I detect CVE-2023-36566 in my Maven, NuGet, PyPI dependencies?

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

How do I mitigate CVE-2023-36566 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2023-36566 actively exploited in the wild?

No public exploit code has been indexed for CVE-2023-36566 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-2023-36566?

CVE-2023-36566 has an EPSS (Exploit Prediction Scoring System) score of 3.0%, placing it in the 87th 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-2023-36566?

CVE-2023-36566 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2023-36566 published, and has it been updated?

CVE-2023-36566 was published on October 10, 2023 and was last updated on July 7, 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.NET NuGet🐍 PyPI

Not in CISA KEV

MEDIUM severity

CVE-2023-36566 — objectmodel

MEDIUM

CVE-2023-36566 is a medium-severity (CVSS 6.5) Improper Input Validation vulnerability in com.microsoft.commondatamodel:objectmodel. A fix is available for com.microsoft.commondatamodel:objectmodel — see the affected versions and patch details below.

Microsoft Common Data Model SDK Denial of Service Vulnerability

Also known asPYSEC-2026-1261

Published

Oct 10, 2023

Updated

Jul 7, 2026

Affected

3 pkgs

Patched

3 / 3

Exploits

None indexed

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

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-36566.

EPSS Exploitation Probability

via FIRST.org ↗

3.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs87th percentile — riskier than 87% 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

3 pkgs affected

☕com.microsoft.commondatamodel:objectmodel.NETMicrosoft.CommonDataModel.ObjectModel🐍commondatamodel-objectmodel

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

Description

Microsoft Common Data Model SDK Denial of Service Vulnerability

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.microsoft.commondatamodel:objectmodel`	all versions	1.7.4`com.microsoft.commondatamodel:objectmodel:1.7.4`
.NETNuGet	`Microsoft.CommonDataModel.ObjectModel`	all versions	1.7.4`dotnet add package Microsoft.CommonDataModel.ObjectModel --version 1.7.4`
🐍PyPI	`commondatamodel-objectmodel`	all versions	1.7.4`pip install --upgrade 'commondatamodel-objectmodel==1.7.4'`

Affected Products

1 product · 4 configurations

Application

common data model sdkmicrosoft

< 1.7.4

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.microsoft.commondatamodel:objectmodel, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.microsoft.commondatamodel:objectmodel to 1.7.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-36566 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Microsoft Common Data Model SDK Denial of Service Vulnerability

O3 Security · Impact-Aware SCA

Is CVE-2023-36566 in your dependencies?

Find it across Maven, NuGet, PyPI, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Raw vector

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

CWE Classification

CWE-20Improper Input Validation

Weaponization

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

Timeline

Disclosed

Oct 10, 2023

Last updated

Jul 7, 2026

Identifiers

CVE-2023-36566

PYSEC-2026-1261

References

Advisorynvd.nist.gov · CVE 2023 36566 Webmsrc.microsoft.com · CVE 2023 36566

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs with CWE-20 are rated as high or higher (top: critical).

GHSA-fmc8-p6q7-75ccGHSA-pjff-c2wc-f6jmCVE-2026-44265CVE-2026-119280CVE-2026-96631CVE-2026-119210CVE-2026-59978GHSA-c33x-vcv4-vg3gBrowse all CWE-20

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedJul 7, 2026

CVE-2023-36566 — objectmodel

Exploitation Status

No confirmed exploitation observed yet

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-2023-36566 in your dependencies?