CVE-2026-69215Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- Weakness (CWE)
- CWE-565, CWE-1275
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
http4s http4s http4s:http4s (from the name) | before 0.23.35; from 1.0.0-M1, < 1.0.0-M47 | CNA record |
References
- https://github.com/http4s/http4s/security/advisories/GHSA-grh8-3p95-f9rrx-refsource-confirm
- https://github.com/http4s/http4s/commit/c0a37f38d5ee2a568ba57bd9da62f8d79b8b1fccx-refsource-misc
- https://github.com/http4s/http4s/releases/tag/v0.23.35x-refsource-misc
- https://github.com/http4s/http4s/releases/tag/v1.0.0-M47x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.