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python-h2 vulnerabilities

Vulnerabilities published for python-h2 in the last 30 days: 0. Listed in the KEV catalogue: 0.

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Vulnerability: 1

  1. CVE-2026-71554

    Medium · CVSS 5.3EPSS 0.42%No fix published

    h2: Duplicate Host header could facilitate request smuggling

    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/2 to HTTP/1.1, the resulting request carries two Host header lines, providing a request smuggling primitive. This issue is fixed in version 4.4.1.

    python-h2Operating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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