Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/http4s/http4s/commit/6e825719b8d2f1538f2c49089c2dc81321a833b4
- https://github.com/http4s/http4s/releases/tag/v0.23.35
- https://github.com/http4s/http4s/releases/tag/v1.0.0-M47
- https://github.com/http4s/http4s/security/advisories/GHSA-2rgg-r783-mrx4
FAQ
What is CVE-2026-69212?
CVE-2026-69212 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...
How severe is CVE-2026-69212?
CVE-2026-69212 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-69212?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.