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CVE details

CVE-2026-116578

Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, tornado.web.RedirectHandler URL templates can place regex-capture substitutions where crafted request paths change the redirect scheme or network location. Affected placements include substitutions at the start of a path, directly after a fixed host, or at the beginning of the template, including protocol-relative, absolute, backslash, encoded, host-extension, and user-info variants interpreted by browsers as attacker-controlled destinations. Static templates and substitutions after a fixed host followed by a slash are not affected. An attacker can use the resulting open redirect on the application's domain for phishing. This issue is fixed in version 6.6.

Score
2.1 low
Published
2026-10-26
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
www/py-tornadopy312-tornado6.5.10unaddressedsunpoet@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>py312-tornado</name>
	<range><lt>6.6</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Tornado is a Python web framework and asynchronous networking library.
	Prior to 6.6, tornado.web.RedirectHandler URL templates can place
	regex-capture substitutions where crafted request paths change the
	redirect scheme or network location. Affected placements include
	substitutions at the start of a path, directly after a fixed host, or
	at the beginning of the template, including protocol-relative,
	absolute, backslash, encoded, host-extension, and user-info variants
	interpreted by browsers as attacker-controlled destinations. Static
	templates and substitutions after a fixed host followed by a slash are
	not affected. An attacker can use the resulting open redirect on the
	application's domain for phishing. This issue is fixed in version 6.6.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-116578</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-116578</url>
    </references>
    <dates>
      <discovery>2026-10-26</discovery>
      <entry>2026-10-27</entry>
    </dates>
  </vuln>