CVE WatchSep 16, 2026

CVE-2026-69211

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, ResponseCookie.render writes attacker-influenced name, conten

CVSS

4.8

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 15, 2026 · Last modified: Sep 16, 2026 · CWE-113 · CWE-1286

EPSS · 30d

Not enough EPSS history yet.

Technical description

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, ResponseCookie.render writes attacker-influenced name, content, domain, path, and extension values without neutralizing semicolons or control characters. An application that constructs a ResponseCookie from unvalidated input can therefore emit injected cookie attributes such as Domain, Path, or SameSite, widening cookie scope or weakening protections, and control characters may enable header splitting on permissive backends. The patch strips control characters from all five fields and strips semicolons from name, content, domain, and path while retaining the extension delimiter behavior. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Official references

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