# CVE-2023-36814: Products.CMFCore unauthenticated denial of service and crash via unchecked use of input with Python's marshal module

> Unauthenticated attackers can cause a denial of service and crash in Zope CMF applications by sending malicious input to a public method.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Jul 2023
- **Updated:** 22 Nov 2024
- **Also known as:** GHSA-4hpj-8rhv-9x87, PYSEC-2023-113

## What is CVE-2023-36814?

CVE-2023-36814 is a high-severity denial of service vulnerability in zopefoundation Products.CMFCore, published on 3 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Products.CMFCore are the key framework services for the Zope Content Management Framework (CMF). The use of Python's marshal module to handle unchecked input in a public method on `PortalFolder` objects can lead to an unauthenticated denial of service and crash situation. The code in question is exposed by all portal software built on top of `Products.CMFCore`, such as Plone. All deployments are vulnerable. The code has been fixed in `Products.CMFCore` version 3.2.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2023-36814?

5 open source packages ship an affected version, including Products.CMFCore and products-cmfcore. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Products.CMFCore` | PyPI | All versions | 2.7.1 |
| `Products.CMFCore` | PyPI | From 3.0 | 3.2 |
| `products-cmfcore` | PyPI | All versions | 2.7.1 |
| `products-cmfcore` | PyPI | All versions | 3.2 |
| `products-cmfcore` | PyPI | From 3.0 | 3.2 |

Products: Zope Products.cmfcore.

## How do I fix CVE-2023-36814?

Upgrade Products.CMFCore to a fixed version for your release line: 2.7.1 or 3.2.

## Is CVE-2023-36814 being exploited?

There is no known exploitation of CVE-2023-36814 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-36814 and fix it if it is affected.

What it is: CVE-2023-36814 is a high-severity denial of service vulnerability in zopefoundation Products.CMFCore, published on 3 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-36814 in the wild and no public exploit code.

Affected packages and fixed versions:
- Products.CMFCore (PyPI): affected all versions; fixed in 2.7.1
- Products.CMFCore (PyPI): affected from 3.0; fixed in 3.2
- products-cmfcore (PyPI): affected all versions; fixed in 2.7.1
- products-cmfcore (PyPI): affected all versions; fixed in 3.2
- products-cmfcore (PyPI): affected from 3.0; fixed in 3.2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-36814/ (Markdown: https://insights.sbomify.com/CVE-2023-36814/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-36814
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-36814
- OSV: https://osv.dev/vulnerability/CVE-2023-36814

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-36814/
Summaries are generated and may contain mistakes; the official description above is the record.