Parameter Injection Affecting tornado package, versions [,6.5.5)
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-PYTHON-TORNADO-15467448
- published12 Mar 2026
- disclosed11 Mar 2026
- creditDHIRAL2908
Introduced: 11 Mar 2026
CVE-2026-35536 (opens in a new tab)How to fix?
Upgrade tornado to version 6.5.5 or higher.
Overview
tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.
Affected versions of this package are vulnerable to Parameter Injection in the set_cookie() function in web.py. An attacker can manipulate cookie attributes by injecting values after a semicolon into the domain, path, or samesite parameters.