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CVE-2022-39348 — Twisted vulnerable to NameVirtualHost Host header injection

2026-09-29T23:05:29.278511+00:00

Affected: twisted

Twisted is an event-based framework for internet applications. Started with version 0.9.4, 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. In practice this should be very difficult to exploit as being able to modify the Host header of a normal HTTP request implies that one is already in a privileged position. This issue was fixed in version 22.10.0rc1. There are no known workarounds.

GHSA-vg46-2rrj-3647 — Twisted vulnerable to NameVirtualHost Host header injection

2026-09-29T23:05:29.278677+00:00

Affected: PyPI: Twisted

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: ```python 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:

HELLO THERE

" http://localhost:8080/

404 - No Such Resource

No Such Resource

host b'

hello there

' not in vhost map

```

This vulnerability was introduced in f49041bb67792506d85aeda9cf6157e92f8048f4 and first appeared in the 0.9.4 release.

PYSEC-2026-1055 — Twisted vulnerable to NameVirtualHost Host header injection

2026-09-29T23:05:29.278785+00:00

Affected: PyPI: twisted