Incorrect Behavior Order: Validate Before Canonicalize Affecting guzzlehttp/guzzle package, versions <7.15.2>=8.0.0, <8.0.1
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PHP-GUZZLEHTTPGUZZLE-18543664
- published5 Aug 2026
- disclosed4 Aug 2026
- creditGraham Campbell
Introduced: 4 Aug 2026
NewCVE-2026-69245 (opens in a new tab)How to fix?
Upgrade guzzlehttp/guzzle to version 7.15.2, 8.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize in the SetCookie::matchesDomain. An attacker can gain unauthorized access to sensitive information or manipulate session state by exploiting noncanonical domain representations in cookie handling, allowing cookies to be sent to unintended subdomains.
Note: This is only exploitable if cookie support is enabled, the application addresses an origin using a noncanonical domain spelling, and communicates with a host whose name ends with that spelling.