Is CVE-2026-67355 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-67355?

CVE-2026-67355 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-67355

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.