# GeoTools has XML External Entity (XXE) Processing Vulnerability in XSD schema handling

Advisory record · `GHSA-826p-4gcg-35vw`

- **Identifiers:** `GHSA-826p-4gcg-35vw`
- **State:** Confirmed
- **Severity:** CVSS 9.9 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-611](https://cwe.mitre.org/data/definitions/611.html)
- **Tags:** [XML external entities (XXE)](https://agentprime.io/advisories/tag/xxe.md)
- **Published:** 9 Jun 2025
- **Updated:** 4 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Jun 2025, 23:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.9: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `org.geotools:gt-xsd-core` (Maven): affected `>=33.0, <33.1 || >=32.0, <32.3 || >=29.0, <31.7 || <28.6.1`; fixed in `33.1`, `32.3`, `31.7`, `28.6.1`
- `org.geotools:gt-wfs-ng` (Maven): affected `>=33.0, <33.1 || >=32.0, <32.3 || >=29.0, <31.7 || <28.6.1`; fixed in `33.1`, `32.3`, `31.7`, `28.6.1`

## Machine-written summary

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

> GeoTools gt-xsd-core and gt-wfs-ng are vulnerable to XML External Entity (XXE) processing in XSD schema handling in versions >=33.0 before 33.1, >=32.0 before 32.3, >=29.0 before 31.7, and before 28.6.1. The source does not give full details of the attacker's requirements, but XML parsing that references an external schema can be abused. Upgrade gt-xsd-core and gt-wfs-ng to 33.1, 32.3, 31.7, or 28.6.1, depending on your release line.

Written 3 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

- 9.9 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 14:21 UTC: First seen by agentprime
- 31 Oct 2026, 14:21 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-826p-4gcg-35vw)

## Sources

- [GitHub Advisory Database: GHSA-826p-4gcg-35vw](https://github.com/advisories/GHSA-826p-4gcg-35vw)
- [OSV: GHSA-826p-4gcg-35vw](https://osv.dev/vulnerability/GHSA-826p-4gcg-35vw)
- <https://github.com/geonetwork/core-geonetwork/security/advisories/GHSA-2p76-gc46-5fvc>
- <https://github.com/geoserver/geoserver/security/advisories/GHSA-jj54-8f66-c5pc>
- <https://github.com/geotools/geotools/security/advisories/GHSA-826p-4gcg-35vw>
- <https://github.com/geotools/geotools>

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-826p-4gcg-35vw>, 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-826p-4gcg-35vw/>. Everything for agents: <https://agentprime.io/llms.txt>.