Description
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Request parses the Host header using an AUTHORITY regular expression that accepts characters not permitted in RFC-compliant hostnames, including /, ?, #, and @. Because req.host returns the full parsed value, applications that validate hosts using naive prefix or suffix checks can be bypassed. This can lead to host header poisoning in applications that use req.host, req.url, or req.base_url for link generation, redirects, or origin validation. This issue has been patched in versions 3.1.21 and 3.2.6.
INFO
Published Date :
2026-04-02T17:09:07.047Z
Last Modified :
2026-04-02T17:44:03.453Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-34835 vulnerability.
| Vendors | Products |
|---|---|
| Rack |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34835.
