CVE-2026-67355

MEDIUM 5.9

guzzlehttp/guzzle before 7.15.1 Host-only Cookie Scope

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-201
Vendor	guzzle
Product	guzzle
Published	Aug 1, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

guzzle / guzzle

0 < 7.15.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577 vulncheck.com: https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope

Credits

🔍 GrahamCampbell