medium5.9
CVE-2026-69212
Http4s is a Scala interface for HTTP services.
Impact
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The FollowRedirect client middleware strips Authorization and Cookie headers only when a redirect changes authority, but authority comparison excludes the URI scheme. A same-authority redirect from HTTPS to HTTP therefore preserves credentials and transmits them over a plaintext connection. An attacker who can induce the downgrade and observe the network can capture those sensitive headers from applications using FollowRedirect. This issue is fixed in versions 0.23.35 and 1.0.0-M47.
Affected products
| Product | Affected versions |
|---|---|
| Http4s Is A Scala Interface For HTTP Services. | before 0.23.35 |
Versions were read from the advisory text. No structured product data has been published for this record yet.