{"cve":"CVE-2026-67355","nvd":{"published":"2026-08-01T13:17:06.283","modified":"2026-10-08T16:17:32.907","status":"Awaiting Analysis","description":"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.","cvss_v4":{"vector":"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","score":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-201"],"references":["https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577","https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-67355","score":0.00366,"percentile":0.30184,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wm3w-8rrp-j577","url":"https://osv.dev/vulnerability/GHSA-wm3w-8rrp-j577","summary":"Guzzle: Host-only cookie scope is not preserved","modified":"2026-09-10T03:51:12.418606242Z","packages":[{"ecosystem":"Packagist","name":"guzzlehttp/guzzle","purl":"pkg:composer/guzzlehttp/guzzle","ranges":["<7.15.1"],"fixed":["7.15.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}