python-hyper h2 vulnerabilities (CVE)

CVE records published for python-hyper h2, newest first. Follow to get an email when a new one appears.

2 results
5.3Medium
CVE-2026-71554

h2: Duplicate Host header could facilitate request smuggling

python-hyper h2

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP…