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

Products.CMFCore unauthenticated denial of service and crash via unchecked use of input with Python's marshal module (CVE-2023-36814) | HOL Guard CVE

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps products-cmfcore (pypi), products-cmfcore (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
products-cmfcorepypi	>=3.0 <3.2	3.2
products-cmfcorepypi	>=0 <2.7.1	2.7.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for products-cmfcore, products-cmfcore.
Review the reported fix. Update products-cmfcore to 3.2; products-cmfcore to 2.7.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 5, 2023
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

### 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 [[email protected]](mailto:[email protected])

Quoted source text, attributed separately from HOL analysis.