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The vulnerability CVE-2026-57576 affects Plone.
It resides in plone.app.dexterity and plone.app.contenttypes.
Plone is a content management system.
An authenticated user can create content.
The user supplies excessively long .
Or excessively long description.
Or excessively long uploaded-file name.
No effective length validation occurs.
The application accepts and stores huge strings.
This causes uncontrolled resource consumption.
CWE-400 describes this weakness.
Rendering the content becomes expensive.
Database queries may slow down.
UI attempts to display huge fields.
Browser rendering consumes memory.
Plone becomes unresponsive.
The content may load eventually.
But editing becomes unwieldy.
Deleting also becomes difficult.
The UI may freeze or time out.
Attack requires authentication.
No user interaction needed beyond submission.
The attack vector is network based.
Complexity is low.
Privileges required are low.
Availability impact is high.
Confidentiality and integrity impacts are none.
CVSS 3.1 base score is 6.5 Medium.
Patched versions fix the validation.
Versions 5.0.1, 4.1.3, 3.2.3 are safe.
Also plone.app.contenttypes patched.
Versions 5.0.1, 4.0.10, 3.0.12.
No known workarounds exist.
Reported by Aldin Visnjic.
Fixes developed publicly.
DailyCVE Form:
Platform: Plone
Version: ≤ 5.0.0
Vulnerability: Denial of Service
Severity: Moderate (6.5)
date: Jun 23 2026
Prediction: Sep 23 2026
(end of form)
What Undercode Say:
pip show plone.app.dexterity
grep -r "max_length" site-packages/plone/app/dexterity
python -c "print('A'1000000)"
curl -X POST http://plone-site/++add++Document -d "=$(python -c 'print(\"A\"1000000)')&description=..."
How Exploit: (Educational Purposes!)
Authenticate to Plone.
Navigate to content creation form.
Enter a of 1,000,000 characters.
Submit the form.
Observe Plone unresponsiveness.
Attempt to edit or delete the content.
Note the UI freeze.
Protection: from this CVE
Update plone.app.dexterity to 5.0.1, 4.1.3, or 3.2.3.
Update plone.app.contenttypes to 5.0.1, 4.0.10, or 3.0.12.
Enforce maximum and description lengths.
Monitor for abnormal content creation.
Restrict content creation privileges.
Impact:
Denial of Service.
Plone becomes unresponsive.
Content difficult to edit or delete.
UI freeze or timeout.
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Sources:
Reported By: github.com
Extra Source Hub:
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