CVE WatchSep 16, 2026

CVE-2026-69215

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware uses unanchored substring che

CVSS

6.8

Medium

EPSS

0.5%

p43

KEV

—

Exploit Today

0-100

Published: Sep 15, 2026 · Last modified: Sep 16, 2026 · CWE-565 · CWE-1275

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-10-082026-11-05

Technical description

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware uses unanchored substring checks instead of RFC 6265 domain and path matching when deciding whether to attach a stored cookie. A cookie for example.com can consequently be sent to an attacker-controlled hostname such as evilexample.com when an application using the same jar makes an attacker-influenced outbound request. This exposes session or authentication cookies and can enable hijacking of the application’s outbound sessions. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Official references

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