Vulnerabilities in pkg:pypi/plone.app.dexterity

PACKAGE
Advisory Identifier: GHSA-5426-92w4-wvhv
Advisory Summary

CVE-2026-57576 is a MODERATE (CVSS 6.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Plone.app.dexterity libraries in the PyPI ecosystem. The issue involves plone.app.dexterity has a denial of service due to excessive title or description length. Remediation is available by upgrading affected packages to version 5.0.1, 4.1.3, 3.2.3.

4 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/plone.app.dexterity

4 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/plone.app.dexterity. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-5426-92w4-wvhv CVE-2026-57576 MODERATE plone.app.dexterity has a Denial of Service due to excessive title or description length
GHSA-wq6x-g685-w5f2 CVE-2020-28734 HIGH Improper Restriction of XML External Entity Reference in Plone
GHSA-x7wf-5mjc-6x76 CVE-2020-28735 HIGH SSRF attacks via tracebacks in Plone
GHSA-2c8c-84w2-j38j CVE-2020-28736 HIGH Improper Restriction of XML External Entity Reference in Plone

CVE-2026-57576 at a Glance

CVE Identifier CVE-2026-57576
GHSA Identifier GHSA-5426-92w4-wvhv
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Plone.app.dexterity
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-57576

To remediate this vulnerability, upgrade all affected Plone.app.dexterity dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

plone.app.dexterity fixed: 5.0.1
pip install plone.app.dexterity>=5.0.1
plone.app.dexterity fixed: 4.1.3
pip install plone.app.dexterity>=4.1.3
plone.app.dexterity fixed: 3.2.3
pip install plone.app.dexterity>=3.2.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

pip show plone.app.dexterity

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-57576, inspect your installed packages using pip:

pip show plone.app.dexterity

Analyze the terminal output to locate any version of Plone.app.dexterity in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.1), your application is affected.

Note: The pip show plone.app.dexterity command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Plone.app.dexterity, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact When creating content with a very large title or description field, 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.dexterity`. * On Plone 6.2, upgrade to `plone.app.dexterity` 5.0.1. * On Plone 6.1, upgrade to `plone.app.dexterity` 4.1.3. * On Plone 6.0, upgrade to `plone.app.dexterity` 3.2.3. Another part of this problem has been patched in `plone.app.contenttypes`. See [this advisory](https://github.com/plone/plone.app.contenttypes/security/advisories/GHSA-8pcw-h6w9-h46g). ### Workarounds There are no known workarounds. This problem was responsibly reported by Aldin Visnjic to the [Plone/Zope Security Team](mailto:security@plone.org). 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.

CVE-2026-57576 Affected Plone.app.dexterity Versions

3 component(s)
Fixed Versions:
5.0.14.1.33.2.3
Product / Package Ecosystem Affected Versions Fixed Version
plone.app.dexterity
PyPI
≥ 5.0.0
< 5.0.1
All 1 versions
5.0.0
5.0.1
plone.app.dexterity
PyPI
≥ 4.0.0
< 4.1.3
4.1.3
plone.app.dexterity
PyPI
< 3.2.3
3.2.3

References

Frequently Asked Questions

What is CVE-2026-57576?
CVE-2026-57576 is a security vulnerability in Plone.app.dexterity involving plone.app.dexterity has a Denial of Service due to excessive title or description length under CWE-400: Uncontrolled Resource Consumption.
Which Plone.app.dexterity versions are affected?
Affected versions include releases prior to 5.0.1, 4.1.3, 3.2.3 across affected packages: plone.app.dexterity.
What version fixes CVE-2026-57576?
Upgrading to 5.0.1, 4.1.3, 3.2.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is plone.app.dexterity affected?
Yes, plone.app.dexterity is affected in releases prior to 5.0.1, 4.1.3, 3.2.3. Upgrade your dependency to 5.0.1, 4.1.3, 3.2.3 or later.
What is the CVSS score of CVE-2026-57576?
CVE-2026-57576 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-57576?
CVE-2026-57576 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check PyPI dependencies for CVE-2026-57576?
Run the dependency tree command: 'pip show plone.app.dexterity'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5426-92w4-wvhv",
  "modified" : "2026-09-23T21:48:22Z",
  "published" : "2026-09-23T21:48:22Z",
  "aliases" : [ "CVE-2026-57576" ],
  "summary" : "plone.app.dexterity has a Denial of Service due to excessive title or description length",
  "details" : "### Impact\nWhen creating content with a very large title or description field, Plone can become unresponsive. Even if the content loads, it can be hard to edit or delete, because the UI is unwieldy.\n\n### Patches\nThe problem has been patched in `plone.app.dexterity`.\n\n* On Plone 6.2, upgrade to `plone.app.dexterity` 5.0.1.\n* On Plone 6.1, upgrade to `plone.app.dexterity` 4.1.3.\n* On Plone 6.0, upgrade to `plone.app.dexterity` 3.2.3.\n\nAnother part of this problem has been patched in `plone.app.contenttypes`. See [this advisory](https://github.com/plone/plone.app.contenttypes/security/advisories/GHSA-8pcw-h6w9-h46g).\n\n### Workarounds\nThere are no known workarounds.\n\nThis problem was responsibly reported by Aldin Visnjic to the [Plone/Zope Security Team](mailto:security@plone.org). Thank you!\n\nNote: 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "plone.app.dexterity"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.0.1"
      } ]
    } ],
    "versions" : [ "5.0.0" ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "plone.app.dexterity"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.1.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.1.2"
    }
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "plone.app.dexterity"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.2.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.2.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/security/advisories/GHSA-5426-92w4-wvhv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-57576"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/pull/433"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/commit/0d317df663823445200d0569a66a95b7e4a9c50d"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/commit/2fdceb120ca86682a408f3a14753cfcf5126d9d9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/commit/411689047f9a3521899ae6992a9b0efbd0592a8f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/commit/cbcef731c0882146b9bf30688cdc639d879878fb"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/commit/f3596538cf7670bb8bc27b0dfa0b1da41c8b8a3a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/commit/fb45bfdb18f1dfb3ed55e477947a3df9a6ee9e20"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/plone/plone.app.dexterity"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/releases/tag/3.2.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/releases/tag/4.1.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/plone.app.dexterity/releases/tag/5.0.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-23T21:48:22Z",
    "nvd_published_at" : "2026-09-22T23:17:07Z"
  }
}