All vulnerabilities
CVE-2026-100725GHSA-pr33-38xx-6r26

http4k before 6.48.0.0 Cookie Scoping Bypass via BasicCookieStorage

http4k http4kMavenLibraries & packages
Open in ThreatlineRecord JSON
CVSS
8.3High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.48.0.0Also 5.42.0.0, 4.51.0.0CVE List
Published27 Sep 2026Updated 28 Sep 2026CVE List

What fixes it

  • 6.48.0.0http4kCVE List
  • 5.42.0.0http4kCVE List
  • 4.51.0.0http4kCVE List
  • 6.48.0.0org.http4k:http4k-core, MavenOSV<dependency><groupId>org.http4k</groupId><artifactId>http4k-core</artifactId><version>6.48.0.0</version></dependency>
  • 5.42.0.0org.http4k:http4k-core, MavenOSV<dependency><groupId>org.http4k</groupId><artifactId>http4k-core</artifactId><version>5.42.0.0</version></dependency>
  • 4.51.0.0org.http4k:http4k-core, MavenOSV<dependency><groupId>org.http4k</groupId><artifactId>http4k-core</artifactId><version>4.51.0.0</version></dependency>

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

http4k (Maven artifact org.http4k:http4k-core) before 6.48.0.0, 5.42.0.0, and 4.51.0.0 ships a BasicCookieStorage (client-side cookie store used by ClientFilters.Cookies) that does not enforce RFC 6265 scoping rules for the cookie domain, path, and Secure attributes. When a single BasicCookieStorage instance is used to talk to more than one origin or scheme, cookies stored for one origin can be sent to other origins, and cookies marked Secure can be sent over plain HTTP, potentially disclosing session cookies or other sensitive values to unauthorized hosts or network observers. Clients that use a storage instance for a single origin are not affected.

Text from CVE List

Affected versions 159

  • http4kaffected: all versions before 6.48.0.0CVE List
  • http4kunaffected: 6.48.0.0CVE List
  • http4kaffected: all versions before 5.42.0.0CVE List
  • http4kunaffected: 5.42.0.0CVE List
  • http4kaffected: all versions before 4.51.0.0CVE List
  • http4kunaffected: 4.51.0.0CVE List
  • org.http4k:http4k-core, Mavenfrom 6.0.0.0, fixed in 6.48.0.0OSV
  • org.http4k:http4k-core, Maven6.0.0.0OSV
  • org.http4k:http4k-core, Maven6.0.1.0OSV
  • org.http4k:http4k-core, Maven6.1.0.0OSV
  • org.http4k:http4k-core, Maven6.1.0.1OSV
  • org.http4k:http4k-core, Maven6.10.0.0OSV
  • org.http4k:http4k-core, Maven6.10.1.0OSV
  • org.http4k:http4k-core, Maven6.10.2.0OSV
  • org.http4k:http4k-core, Maven6.11.0.0OSV
  • org.http4k:http4k-core, Maven6.11.1.0OSV
  • org.http4k:http4k-core, Maven6.12.0.0OSV
  • org.http4k:http4k-core, Maven6.13.0.0OSV
  • org.http4k:http4k-core, Maven6.14.0.0OSV
  • org.http4k:http4k-core, Maven6.15.0.0OSV
  • org.http4k:http4k-core, Maven6.15.0.1OSV
  • org.http4k:http4k-core, Maven6.15.1.0OSV
  • org.http4k:http4k-core, Maven6.16.0.0OSV
  • org.http4k:http4k-core, Maven6.17.0.0OSV
  • org.http4k:http4k-core, Maven6.18.0.1OSV
  • org.http4k:http4k-core, Maven6.18.1.0OSV
  • org.http4k:http4k-core, Maven6.19.0.0OSV
  • org.http4k:http4k-core, Maven6.2.0.0OSV
  • org.http4k:http4k-core, Maven6.20.0.0OSV
  • org.http4k:http4k-core, Maven6.20.0.1OSV
  • org.http4k:http4k-core, Maven6.20.0.2OSV
  • org.http4k:http4k-core, Maven6.20.0.3OSV
  • org.http4k:http4k-core, Maven6.20.1.0OSV
  • org.http4k:http4k-core, Maven6.20.2.0OSV
  • org.http4k:http4k-core, Maven6.20.2.1OSV
  • org.http4k:http4k-core, Maven6.21.0.0OSV
  • org.http4k:http4k-core, Maven6.21.1.0OSV
  • org.http4k:http4k-core, Maven6.22.0.0OSV
  • org.http4k:http4k-core, Maven6.23.0.0OSV
  • org.http4k:http4k-core, Maven6.23.1.0OSV
  • org.http4k:http4k-core, Maven6.24.0.0OSV
  • org.http4k:http4k-core, Maven6.24.1.0OSV
  • org.http4k:http4k-core, Maven6.25.0.0OSV
  • org.http4k:http4k-core, Maven6.25.1.0OSV
  • org.http4k:http4k-core, Maven6.26.0.0OSV
  • org.http4k:http4k-core, Maven6.26.1.0OSV
  • org.http4k:http4k-core, Maven6.27.0.0OSV
  • org.http4k:http4k-core, Maven6.28.0.0OSV
  • org.http4k:http4k-core, Maven6.28.1.0OSV
  • org.http4k:http4k-core, Maven6.29.0.0OSV
  • org.http4k:http4k-core, Maven6.30.0.0OSV
  • org.http4k:http4k-core, Maven6.30.1.0OSV
  • org.http4k:http4k-core, Maven6.31.0.0OSV
  • org.http4k:http4k-core, Maven6.31.1.0OSV
  • org.http4k:http4k-core, Maven6.32.0.0OSV
  • org.http4k:http4k-core, Maven6.33.0.0OSV
  • org.http4k:http4k-core, Maven6.34.0.0OSV
  • org.http4k:http4k-core, Mavenfrom 5.0.0.0, fixed in 5.42.0.0OSV
  • org.http4k:http4k-core, Maven5.0.0.0OSV
  • org.http4k:http4k-core, Maven5.1.0.0OSV
  • org.http4k:http4k-core, Maven5.1.1.0OSV
  • org.http4k:http4k-core, Maven5.1.1.1OSV
  • org.http4k:http4k-core, Maven5.1.2.0OSV
  • org.http4k:http4k-core, Maven5.1.2.1OSV
  • org.http4k:http4k-core, Maven5.10.0.0OSV
  • org.http4k:http4k-core, Maven5.10.1.0OSV
  • org.http4k:http4k-core, Maven5.10.2.0OSV
  • org.http4k:http4k-core, Maven5.10.3.0OSV
  • org.http4k:http4k-core, Maven5.10.4.0OSV
  • org.http4k:http4k-core, Maven5.10.5.0OSV
  • org.http4k:http4k-core, Maven5.10.6.0OSV
  • org.http4k:http4k-core, Maven5.10.7.0OSV
  • org.http4k:http4k-core, Maven5.11.0.0OSV
  • org.http4k:http4k-core, Maven5.11.1.0OSV
  • org.http4k:http4k-core, Maven5.12.0.0OSV
  • org.http4k:http4k-core, Maven5.12.1.0OSV
  • org.http4k:http4k-core, Maven5.12.2.0OSV
  • org.http4k:http4k-core, Maven5.12.2.1OSV
  • org.http4k:http4k-core, Maven5.13.0.0OSV
  • org.http4k:http4k-core, Maven5.13.0.1OSV
  • org.http4k:http4k-core, Maven5.13.1.0OSV
  • org.http4k:http4k-core, Maven5.13.2.0OSV
  • org.http4k:http4k-core, Maven5.13.4.0OSV
  • org.http4k:http4k-core, Maven5.13.4.1OSV
  • org.http4k:http4k-core, Maven5.13.5.0OSV
  • org.http4k:http4k-core, Maven5.13.6.0OSV
  • org.http4k:http4k-core, Maven5.13.6.1OSV
  • org.http4k:http4k-core, Maven5.13.7.0OSV
  • org.http4k:http4k-core, Maven5.13.8.0OSV
  • org.http4k:http4k-core, Maven5.13.9.0OSV
  • org.http4k:http4k-core, Maven5.14.0.0OSV
  • org.http4k:http4k-core, Maven5.14.1.0OSV
  • org.http4k:http4k-core, Maven5.14.2.0OSV
  • org.http4k:http4k-core, Maven5.14.4.0OSV
  • org.http4k:http4k-core, Maven5.14.5.0OSV
  • org.http4k:http4k-core, Maven5.15.0.0OSV
  • org.http4k:http4k-core, Maven5.16.0.0OSV
  • org.http4k:http4k-core, Maven5.16.1.0OSV
  • org.http4k:http4k-core, Maven5.16.2.0OSV
  • org.http4k:http4k-core, Maven5.17.0.0OSV
  • org.http4k:http4k-core, Maven5.18.1.0OSV
  • org.http4k:http4k-core, Maven5.18.2.0OSV
  • org.http4k:http4k-core, Maven5.19.0.0OSV
  • org.http4k:http4k-core, Maven5.2.0.0OSV
  • org.http4k:http4k-core, Maven5.2.1.0OSV
  • org.http4k:http4k-core, Maven5.20.0.0OSV
  • org.http4k:http4k-core, Maven5.21.0.0OSV
  • org.http4k:http4k-core, Maven5.21.1.0OSV
  • org.http4k:http4k-core, Mavenfrom first release, fixed in 4.51.0.0OSV
  • org.http4k:http4k-core, Maven0.21.0OSV
  • org.http4k:http4k-core, Maven0.22.0OSV
  • org.http4k:http4k-core, Maven1.0.0OSV
  • org.http4k:http4k-core, Maven1.1.0OSV
  • org.http4k:http4k-core, Maven1.10.0OSV
  • org.http4k:http4k-core, Maven1.11.0OSV
  • org.http4k:http4k-core, Maven1.13.0OSV
  • org.http4k:http4k-core, Maven1.14.0OSV
  • org.http4k:http4k-core, Maven1.15.0OSV
  • org.http4k:http4k-core, Maven1.16.0OSV
  • org.http4k:http4k-core, Maven1.17.0OSV
  • org.http4k:http4k-core, Maven1.18.0OSV
  • org.http4k:http4k-core, Maven1.19.0OSV
  • org.http4k:http4k-core, Maven1.19.1OSV
  • org.http4k:http4k-core, Maven1.2.0OSV
  • org.http4k:http4k-core, Maven1.20.0OSV
  • org.http4k:http4k-core, Maven1.21.0OSV
  • org.http4k:http4k-core, Maven1.21.1OSV
  • org.http4k:http4k-core, Maven1.22.0OSV
  • org.http4k:http4k-core, Maven1.22.2OSV
  • org.http4k:http4k-core, Maven1.23.0OSV
  • org.http4k:http4k-core, Maven1.24.0OSV
  • org.http4k:http4k-core, Maven1.25.0OSV
  • org.http4k:http4k-core, Maven1.25.1OSV
  • org.http4k:http4k-core, Maven1.26.0OSV
  • org.http4k:http4k-core, Maven1.26.1OSV
  • org.http4k:http4k-core, Maven1.26.2OSV
  • org.http4k:http4k-core, Maven1.27.0OSV
  • org.http4k:http4k-core, Maven1.28.0OSV
  • org.http4k:http4k-core, Maven1.3.0OSV
  • org.http4k:http4k-core, Maven1.30.0OSV
  • org.http4k:http4k-core, Maven1.31.0OSV
  • org.http4k:http4k-core, Maven1.32.0OSV
  • org.http4k:http4k-core, Maven1.32.1OSV
  • org.http4k:http4k-core, Maven1.32.2OSV
  • org.http4k:http4k-core, Maven1.33.0OSV
  • org.http4k:http4k-core, Maven1.33.1OSV
  • org.http4k:http4k-core, Maven1.4.0OSV
  • org.http4k:http4k-core, Maven1.5.0OSV
  • org.http4k:http4k-core, Maven1.6.0OSV
  • org.http4k:http4k-core, Maven1.7.0OSV
  • org.http4k:http4k-core, Maven1.8.0OSV
  • org.http4k:http4k-core, Maven1.9.0OSV
  • org.http4k:http4k-core, Maven2.0.0OSV
  • org.http4k:http4k-core, Maven2.0.1OSV
  • org.http4k:http4k-core, Maven2.0.2OSV
  • org.http4k:http4k-core, Maven2.0.3OSV
  • org.http4k:http4k-core, Maven2.0.4OSV
  • org.http4k:http4k-core, Maven2.0.5OSV
  • org.http4k:http4k-core, Maven2.1.0OSV

References 3