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<h1>What’s new in Tornado 4.4.2<a class="headerlink" href="#what-s-new-in-tornado-4-4-2" title="Permalink to this headline">¶</a></h1>
<div class="section" id="oct-1-2016">
<h2>Oct 1, 2016<a class="headerlink" href="#oct-1-2016" title="Permalink to this headline">¶</a></h2>
<div class="section" id="security-fixes">
<h3>Security fixes<a class="headerlink" href="#security-fixes" title="Permalink to this headline">¶</a></h3>
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<li>A difference in cookie parsing between Tornado and web browsers
(especially when combined with Google Analytics) could allow an
attacker to set arbitrary cookies and bypass XSRF protection. The
cookie parser has been rewritten to fix this attack.</li>
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<div class="section" id="backwards-compatibility-notes">
<h3>Backwards-compatibility notes<a class="headerlink" href="#backwards-compatibility-notes" title="Permalink to this headline">¶</a></h3>
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<li>Cookies containing certain special characters (in particular semicolon
and square brackets) are now parsed differently.</li>
<li>If the cookie header contains a combination of valid and invalid cookies,
the valid ones will be returned (older versions of Tornado would reject the
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