Incorrectly Specified Destination in a Communication Channel Affecting guzzlehttp/guzzle package, versions <7.15.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-GUZZLEHTTPGUZZLE-18306777
- published25 Jul 2026
- disclosed20 Jul 2026
- creditUnknown
Introduced: 20 Jul 2026
CVE-2026-67355 (opens in a new tab)How to fix?
Upgrade guzzlehttp/guzzle to version 7.15.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrectly Specified Destination in a Communication Channel via improper handling of host-only cookies in the CookieJar process. An attacker can obtain sensitive information such as session identifiers or authorization tokens by controlling or observing a child host and receiving cookies intended only for the parent host. This is only exploitable if the application enables cookie support, reuses the same built-in cookie jar, receives a host-only cookie from a parent host, and later makes a matching request to a less-trusted child host.
Workaround
This vulnerability can be mitigated by using a separate cookie jar for each host or trust boundary, disabling cookie handling for requests to less-trusted hosts, or avoiding requests to less-trusted subdomains through a client configured with a shared jar.