{"id":"CVE-2026-67355","title":"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","summary":"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 inten…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-201"],"vendor":"guzzle","product":"guzzle","affected":["guzzle < 7.15.1"],"published":"2026-08-01","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:32.907","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67355","references":[{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-03T19:37:13.624487Z"},"epss":0.00366,"epssPercentile":0.30284,"ingestedAt":"2026-08-02T09:18:11.823Z","slug":"CVE-2026-67355","body":"## Overview\n\nguzzlehttp/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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}