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CVE-2026-69211

Http4s: Set-Cookie rendering does not escape attribute delimiters PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
http4s / http4saffected < 0.23.35; affected >= 1.0.0-M1, < 1.0.0-M47

CWE

CWE-113, CWE-1286

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.