CVE-2026-67355 Details
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.
A vulnerability exists in GuzzleHTTP Guzzle versions prior to 7.15.1, where host-only cookie scope is not properly maintained. Instead of marking cookies as host-only, the library incorrectly stores the request host in the Domain field. This flaw allows attackers controlling child hosts to access host-only cookies meant for parent hosts, potentially revealing session identifiers and authorization tokens when the same cookie jar is used across different trust boundaries.
Users can upgrade to GuzzleHTTP Guzzle version 7.15.1 or later, where this vulnerability is patched. If an immediate upgrade is not possible, it is recommended to use separate cookie jars for each host or trust boundary, disable cookie handling for less-trusted hosts, or avoid using a shared cookie jar for clients that may contact both trusted and less-trusted domains.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 3, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-201 | Insertion of Sensitive Information Into Sent Data | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 3, 2026 | CVE Modified | CISA-ADP |
| Aug 1, 2026 | New CVE Received | [email protected] |