CVE-2026-69215 Details
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.
A vulnerability in the Http4s library's CookieJar client middleware allows for cross-origin cookie leakage. This issue is present in versions through 0.23.34 and 1.0.0-M46. The vulnerability arises because the CookieJar middleware uses unanchored substring checks for domain and path matching, rather than adhering to the domain matching rules specified in RFC 6265. As a result, cookies intended for 'example.com' can be sent to attacker-controlled hostnames, such as 'evilexample.com', during outbound requests influenced by the attacker. This leakage can expose session or authentication cookies, potentially leading to hijacking of the application's outbound sessions.
Upgrade to Http4s versions 0.23.35 or 1.0.0-M47, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 15, 2026CISA-ADP
Assessed Sep 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/http4s/http4s/commit/c0a37f38d5ee2a568ba57bd9da62f8d79b8b1fcc | [email protected] | Source CodeVendor |
| https://github.com/http4s/http4s/releases/tag/v0.23.35 | [email protected] | Release NotesVendor |
| https://github.com/http4s/http4s/releases/tag/v1.0.0-M47 | [email protected] | Release NotesVendor |
| https://github.com/http4s/http4s/security/advisories/GHSA-grh8-3p95-f9rr | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1275 | Sensitive Cookie with Improper SameSite Attribute | [email protected] |
| CWE-565 | Reliance on Cookies without Validation and Integrity Checking | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Http4s | <= 0.23.34 (semver) >= 1.0.0-M1, <= 1.0.0-M46 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 16, 2026 | CVE Modified | CISA-ADP |
| Sep 15, 2026 | New CVE Received | [email protected] |