---
id: CVE-2023-36814
aliases:
  - GHSA-4hpj-8rhv-9x87
  - PYSEC-2023-113
title: >-
  Products.CMFCore unauthenticated denial of service and crash via unchecked use
  of input with Python's marshal module
summary: >-
  Products.CMFCore unauthenticated denial of service and crash via unchecked use
  of input with Python's marshal module
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: products-cmfcore
product: products-cmfcore
ecosystem: pip
affected:
  - 'products-cmfcore >= 3.0, < 3.2'
  - products-cmfcore < 2.7.1
patched:
  - products-cmfcore 3.2
  - products-cmfcore 2.7.1
published: '2023-07-05'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:08.494348851Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-4hpj-8rhv-9x87'
references:
  - url: >-
      https://github.com/zopefoundation/Products.CMFCore/security/advisories/GHSA-4hpj-8rhv-9x87
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-36814'
  - url: >-
      https://github.com/zopefoundation/Products.CMFCore/commit/40f03f43a60f28ca9485c8ef429efef729be54e5
  - url: >-
      https://github.com/zopefoundation/Products.CMFCore/commit/c1847a9042abe7965271fa73762dfe091b576de
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/products-cmfcore/PYSEC-2023-113.yaml
  - url: 'https://github.com/zopefoundation/Products.CMFCore'
tags:
  - osv
  - pip
epss: 0.00723
epssPercentile: 0.52027
ingestedAt: '2026-09-12T03:13:01.653Z'
---

## Overview

### Impact
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.

### Patches
The code has been fixed in `Products.CMFCore` version 3.2.

### Workarounds
Users can make the affected `decodeFolderFilter` method unreachable by editing the `PortalFolder.py` module in `Products.CMFCore` by hand and then restarting Zope. Go to line 233 of `PortalFolder.py` and remove both the `@security.public` decorator for `decodeFolderFilter` as well as the method's entire docstring. This is safe because the method is not actually used by current code.

### References
- Products.CMFCore security advisory [GHSA-4hpj-8rhv-9x87](https://github.com/zopefoundation/Products.CMFCore/security/advisories/GHSA-4hpj-8rhv-9x87)

### Credits
Thanks go to Nicolas VERDIER from onepoint.

### For more information

If you have any questions or comments about this advisory:

- Open an issue in the [Products.CMFCore issue tracker](https://github.com/zopefoundation/Products.CMFCore/issues)
- Email us at [security@plone.org](mailto:security@plone.org)

## Affected packages

- `products-cmfcore >= 3.0, < 3.2`
- `products-cmfcore < 2.7.1`

## Remediation

Upgrade to a patched release:

- `products-cmfcore 3.2`
- `products-cmfcore 2.7.1`