plone.app.contenttypes has a Denial of Service in File Upload due to excessive filename length
Impact
When creating an Image or File with a very large filename, Plone can become unresponsive. Even if the content loads, it can be hard to edit or delete, because the UI is unwieldy.
Patches
The problem has been patched in plone.app.contenttypes.
- On Plone 6.2, upgrade to
plone.app.contenttypes5.0.1. - On Plone 6.1, upgrade to
plone.app.contenttypes4.0.10. - On Plone 6.0, upgrade to
plone.app.contenttypes3.0.12
Another part of this problem has been patched in plone.app.dexterity. See this advisory.
Workarounds
There are no known workarounds.
This problem was responsibly reported by Aldin Visnjic to the Plone/Zope Security Team. Thank you!
Note: The Plone/Zope Security team felt that the kind of fixes that were needed could be disruptive in corner cases if they were not careful. So they decided to develop the fixes publicly, giving the whole community the chance the review, and giving them the benefit from early feedback.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | plone-app-contenttypes | >= 5.0.0, < 5.0.1, >= 4.0.0, < 4.0.10, < 3.0.12 | 5.0.1, 4.0.10, 3.0.12 |
References
- https://github.com/plone/plone.app.contenttypes/security/advisories/GHSA-8pcw-h6w9-h46g
- https://github.com/plone/plone.app.contenttypes/pull/744
- https://github.com/plone/plone.app.contenttypes/commit/13dc98a578341aac24a1e65fd9bc7ac8a07d168a
- https://github.com/plone/plone.app.contenttypes/commit/21bae6ebe424689eeac9a5884fc0da35f4944e63
- https://github.com/plone/plone.app.contenttypes/commit/639c0619f371df578e69ec94e5ca98e60fd6ed58
- https://github.com/plone/plone.app.contenttypes/commit/7bb03e8ec6c6bd0e645f445b0755e85a51afb158
- https://github.com/plone/plone.app.contenttypes/commit/bed1547d4f8b1fc995f2c76f30ba5f20276a8ad6
- https://github.com/plone/plone.app.contenttypes
- https://github.com/plone/plone.app.contenttypes/releases/tag/3.0.12
- https://github.com/plone/plone.app.contenttypes/releases/tag/4.0.10
- https://github.com/plone/plone.app.contenttypes/releases/tag/5.0.1
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- Python (PyPI)
- Package
plone-app-contenttypes- Disclosed
- 23.09.2026
- Updated
- 11.10.2026 15:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8pcw-h6w9-h46g - CC BY 4.0
Vulnerability history: plone-app-contenttypes
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 01.2020 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- Medium 2
Disclosures per year
- 2020: 1
- 2021: 0
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
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plone.app.contenttypes has a Denial of Service in File Upload due to excessive filename length this entry
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