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.
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Affected Vendors & Products
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History
Wed, 16 Sep 2026 19:30:00 +0000
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ssvc
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Tue, 15 Sep 2026 22:30:00 +0000
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Http4s
Http4s http4s |
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Http4s
Http4s http4s |
Tue, 15 Sep 2026 19:30:00 +0000
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| 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. | |
| Title | Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin | |
| Weaknesses | CWE-1275 CWE-565 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-15T19:17:12.429Z
Updated: 2026-09-16T18:36:57.350Z
Reserved: 2026-08-03T16:57:50.125Z
Link: CVE-2026-69215
Updated: 2026-09-16T18:18:33.626Z
Status : Deferred
Published: 2026-09-15T20:17:40.950
Modified: 2026-09-16T20:39:16.610
Link: CVE-2026-69215
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