HIGHCVSS 8.2EPSS 0.2%

CVE-2026-67355

CVE-2026-67355 updated by NVD

Published: 2026-07-20
Modified: 2026-09-10
EPSS percentile: 14%
Sources: github-advisory, nvd

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 intended only for parent hosts, potentially disclosing session identifiers and authorization tokens when the same cookie jar is reused across trust boundaries.

Affected packages

Ecosystem	Package	Affected versions	Fixed versions
Packagist	guzzlehttp/guzzle	—	7.15.1

Remediation: Upgrade to 7.15.1 or later.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-67355

Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.

Includes data from the National Vulnerability Database (NIST). NVD data is in the public domain; this page is not endorsed by NIST.

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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.