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🐍 PyPI
Not in CISA KEV
HIGH severity

CVE-2022-2255 — mod-wsgi

HIGHFix: GrahamDumpleton/mod_wsgi@af3c0c2

CVE-2022-2255 is a high-severity (CVSS 7.5) CWE-348 vulnerability in mod-wsgi. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for mod-wsgi — see the affected versions and patch details below.

Incorrect header handling in mod-wsgi

Also known asBIT-mod_wsgi-2022-2255GHSA-7527-8855-9cf8PYSEC-2022-254
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.48%0.96%1.44%0.7%0.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍mod-wsgi

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPImod-wsgiall versions4.9.3pip install --upgrade 'mod-wsgi==4.9.3'

Affected Products

2 products · 2 configurations
OS
debian linuxdebian
1 version
10.0
Application
mod wsgimodwsgi
< 4.9.3
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A vulnerability was found in mod_wsgi. The X-Client-IP header is not rem…

github.comNVDAug 2022

Report on github.com

github.comNVDAug 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mod-wsgi, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mod-wsgi to 4.9.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-2255 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate
ProductFixed inAdvisory
Red Hat Enterprise Linux 8python39:3.9-8100020250430153343.d47b87a4RHSA-2025:4791

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2022-2255: mod-wsgi — Fixed in 4.9.3