# plone.app.dexterity has a Denial of Service due to excessive title or description length

Advisory record · `GHSA-5426-92w4-wvhv`

- **Identifiers:** `GHSA-5426-92w4-wvhv` · `CVE-2026-57576` · `PYSEC-2026-4137`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 23 Sept 2026
- **Updated:** 1 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 23 Sept 2026, 21:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `plone-app-dexterity` (PyPI): affected `>=5.0.0, <5.0.1 || >=4.0.0, <4.1.3 || <3.2.3`; fixed in `5.0.1`, `4.1.3`, `3.2.3`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> plone.app.dexterity versions below 3.2.3, 4.0.0 to below 4.1.3, and 5.0.0 to below 5.0.1 are affected. Creating content with a very large title or description can make Plone unresponsive and hard to edit or delete. Upgrade to 3.2.3, 4.1.3, or 5.0.1 for your Plone series; no workaround is listed.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0076, the 55th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:09 UTC: First seen by agentprime
- 31 Oct 2026, 14:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5426-92w4-wvhv)

## Sources

- [GitHub Advisory Database: GHSA-5426-92w4-wvhv](https://github.com/advisories/GHSA-5426-92w4-wvhv)
- [OSV: GHSA-5426-92w4-wvhv](https://osv.dev/vulnerability/GHSA-5426-92w4-wvhv)
- <https://github.com/plone/plone.app.dexterity/security/advisories/GHSA-5426-92w4-wvhv>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-57576>
- <https://github.com/plone/plone.app.dexterity/pull/433>
- <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>
- <https://github.com/plone/plone.app.dexterity>
- <https://github.com/plone/plone.app.dexterity/releases/tag/3.2.3>
- <https://github.com/plone/plone.app.dexterity/releases/tag/4.1.3>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-5426-92w4-wvhv>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-5426-92w4-wvhv/>. Everything for agents: <https://agentprime.io/llms.txt>.