GHSA-375F-4R2H-F99J Bandit trusts client-supplied URI scheme on plaintext connections

Summary Bandit reflects the client-supplied URI scheme into conn.scheme without verifying the actual transport. Over a plaintext HTTP/1.1 connection or h2c, an unauthenticated attacker can send an absolute-form request target like GET https://victim/path HTTP/1.1 and the application observes...

CVE-2026-39807 Client-supplied URI scheme trusted without transport verification in bandit

Reliance on Untrusted Inputs in a Security Decision vulnerability in mtrudel bandit allows unauthenticated transport-state spoofing on plaintext HTTP connections. 'Elixir.Bandit.Pipeline':determinescheme/2 in lib/bandit/pipeline.ex returns the client-supplied URI scheme verbatim, ignoring the...