Origin Validation Error Affecting guzzlehttp/guzzle package, versions <7.12.1
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-17400370
- published22 Jun 2026
- disclosed19 Jun 2026
- creditIlia Alshanetsky
Introduced: 19 Jun 2026
CVE-2026-55767 (opens in a new tab)How to fix?
Upgrade guzzlehttp/guzzle to version 7.12.1 or higher.
Overview
Affected versions of this package are vulnerable to Origin Validation Error in the SetCookie::validate() function due to the improper normalization of Domain attribute for shared CookieJar instances. An attacker can access resources or data from a different origin by setting a shared cookie jar that later sent to unrelated hosts using the same jar.