{"id":"UBUNTU-CVE-2026-67355","details":"guzzlehttp/guzzle versions before 7.15.1 fail to preserve host-only cookie scope, storing the request host in the Domain field instead of marking cookies as host-only. Attackers controlling child hosts can receive host-only cookies intended only for parent hosts, potentially disclosing session identifiers and authorization tokens when the same cookie jar is reused across trust boundaries.","modified":"2026-08-06T00:23:23Z","published":"2026-08-01T13:17:00Z","upstream":["CVE-2026-67355"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-67355"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-67355"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope"}],"affected":[{"package":{"name":"guzzle","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/guzzle?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.4.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-guzzlehttp-guzzle","binary_version":"7.4.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67355.json"}},{"package":{"name":"guzzle","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/guzzle?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.9.2-0.1","7.9.2-0.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-guzzlehttp-guzzle","binary_version":"7.9.2-0.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67355.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}