CVE-2026-67355: guzzlehttp/guzzle before 7.15.1 Host-only Cookie Scope

Published Aug 1, 2026
·
Updated

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.

Affected Software

1 affected component
guzzlehttp/guzzle<7.15.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade guzzlehttp/guzzle to a version that resolves this vulnerability.

    Fixed in 7.15.1

Event History

Aug 1, 2026
CVE Published
via MITRE·12:22 PM
Data Sourced
via MITRE·12:22 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeakness
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