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High, CVSS 8.7amended

Products.CMFCore unauthenticated denial of service and crash via unchecked use of input with Python's marshal module

CVE-2023-36814GHSA-4hpj-8rhv-9x87

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (products-cmfcore 3.2, 2.7.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2023-36814: 0.72% estimated exploitation activity in the next 30 days; percentile 54.06 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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 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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-4hpj-8rhv-9x87

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-4hpj-8rhv-9x87

Agent brief

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# Patch Next advisory brief: CVE-2023-36814

Advisory: Products.CMFCore unauthenticated denial of service and crash via unchecked use of input with Python's marshal module
IDs: CVE-2023-36814, GHSA-4hpj-8rhv-9x87
Record: https://patchnext.com/advisories/cve-2023-36814 (revision 3, source checked 26 Oct 2026, 13:21 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: products-cmfcore 3.2, 2.7.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI products-cmfcore: affected >= 3.0, < 3.2; < 2.7.1; fixed in 3.2, 2.7.1

## Suggested inspection (read-only)
- `python -m pip show products-cmfcore`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on products-cmfcore.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-4hpj-8rhv-9x87 (OSV record GHSA-4hpj-8rhv-9x87 lists affected ranges: PyPI products-cmfcore >=3.0 =0 <2.7.1 (fixed))
- Verified: https://github.com/advisories/GHSA-4hpj-8rhv-9x87 (GitHub-reviewed advisory GHSA-4hpj-8rhv-9x87 lists affected ranges: PyPI products-cmfcore >=3.0 =0 <2.7.1)

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