CVE-2026-57576Network attack vectorHinoki check available

Authenticated service hang via oversized content metadata

Published Sep 22, 2026 · Updated Sep 22, 2026

Resource exhaustion in plone.app.dexterity and plone.app.contenttypes allows remote authenticated users to hang a Plone site. Dexterity title and description fields and the Image/File filename field accept values without the patched length limits, leaving oversized content expensive to load and unwieldy to edit or delete. Any authenticated account permitted to create affected content can trigger the service interruption through ordinary content creation.

CVSS severity6.5
Medium
EPSS probability0.76%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Resource exhaustion in plone.app.dexterity and plone.app.contenttypes allows remote authenticated users to hang a Plone site. Dexterity title and description fields and the Image/File filename field accept values without the patched length limits, leaving oversized content expensive to load and unwieldy to edit or delete. Any authenticated account permitted to create affected content can trigger the service interruption through ordinary content creation.

The record

CVE
CVE-2026-57576
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Plone
Product
plone.app.contenttypes
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.12
  2. Affected versionversion=>= 4.0.0, < 4.0.10
  3. Affected versionversion== 5.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Plone · plone.app.contenttypesversion=< 3.0.12; version=>= 4.0.0, < 4.0.10; version== 5.0.0
Plone · plone.app.dexterityversion=< 3.2.3; version=>= 4.0.0, < 4.1.3; version== 5.0.0

Published CVSS scores

6.5GitHub Security Advisory for plone.app.dexterityCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5GitHub Security Advisory for plone.app.contenttypesCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started