CVE-2026-67355CWE-201

CVE-2026-67355

Medium · published August 1, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
29.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00366 · 29.3th percentile
Weakness
CWE-201 · Insertion of Sensitive Information Into Sent Data
Published
2026-08-01T17:17Z
References (2)
https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577 · [email protected]https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope · [email protected]
EPSS history
Timeline
  • 01 AUG 12:22Z
    guzzlehttp/guzzle before 7.15.1 Host-only Cookie Scope
    cvelistv5