Twisted vulnerable to NameVirtualHost Host header injection
When the host header does not match a configured host, twisted.web.vhost.NameVirtualHost will return a NoResource resource which renders the Host header unescaped into the 404 response allowing HTML and script injection.
Example configuration:
from twisted.web.server import Site
from twisted.web.vhost import NameVirtualHost
from twisted.internet import reactor
resource = NameVirtualHost()
site = Site(resource)
reactor.listenTCP(8080, site)
reactor.run()Output:
❯ curl -H"Host:<h1>HELLO THERE</h1>" http://localhost:8080/
<html>
<head><title>404 - No Such Resource</title></head>
<body>
<h1>No Such Resource</h1>
<p>host b'<h1>hello there</h1>' not in vhost map</p>
</body>
</html>This vulnerability was introduced in f49041bb67792506d85aeda9cf6157e92f8048f4 and first appeared in the 0.9.4 release.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | twisted | >= 0.9.4, < 22.10.0rc1 | 22.10.0rc1 |
References
- https://github.com/twisted/twisted/security/advisories/GHSA-vg46-2rrj-3647
- https://nvd.nist.gov/vuln/detail/CVE-2022-39348
- https://github.com/twisted/twisted/commit/f2f5e81c03f14e253e85fe457e646130780db40b
- https://github.com/twisted/twisted/commit/f49041bb67792506d85aeda9cf6157e92f8048f4
- https://github.com/twisted/twisted
- https://lists.debian.org/debian-lts-announce/2022/11/msg00038.html
- https://lists.debian.org/debian-lts-announce/2024/11/msg00028.html
- https://security.gentoo.org/glsa/202301-02
- https://pypi.org/project/twisted
- https://github.com/advisories/GHSA-vg46-2rrj-3647
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79, CWE-80- Platform
- Python (PyPI)
- Package
twisted- Disclosed
- 26.10.2022
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1055 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-vg46-2rrj-3647 - CC BY 4.0
Vulnerability history: twisted
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 06.2019 10.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 4
- Medium 8
Disclosures per year
- 2019: 3
- 2020: 3
- 2021: 0
- 2022: 6
- 2023: 1
- 2024: 2
- 2025: 0
- 2026: 2
-
Twisted vulnerable to NameVirtualHost Host header injection this entry
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