CVE-2026-67355

EUVD-2026-51845
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 13.83%
Debian logo
Debian Releases
Debian Product
Codename
guzzle
bookworm
postponed
forky
7.15.5-1
fixed
sid
7.15.5-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
guzzle
jammy
dne
noble
needs-triage
resolute
needs-triage
Common Weakness Enumeration
References
https://github.com/guzzle/guzzle/security/advisories/GHSA-wm3w-8rrp-j577
https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-host-only-cookie-scope