---
id: CVE-2026-67355
title: >-
  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
summary: >-
  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
  inten…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-201
published: '2026-08-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:35:01.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67355'
references:
  - url: 'https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00229
epssPercentile: 0.13998
ingestedAt: '2026-08-02T09:18:11.823Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.