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CVE-2026-69212

Http4s: FollowRedirect middleware leaks credentials over https->http same-authority redirect

Medium5.9EPSS 0.28%
Published
Updated
Reserved
Assigned by
GitHub_M

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.

Scores

CVSS scores of CVE-2026-69212, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVDNVD · Deferred3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.28% · top 79% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Weakness

Affected products

  • http4s · http4s

    • affected < 0.23.35
    • affected >= 1.0.0-M1, < 1.0.0-M47

References (4)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .