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      <title>CVE-2026-116577 — Tornado: Quadratic CPU usage when parsing HTTP headers with line folding</title>
      <link>https://db.gcve.eu/vuln/cve-2026-116577</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; tornadoweb tornado&lt;/p&gt;
&lt;p&gt;Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, Tornado&amp;#39;s HTTP header parser accepts obsolete line folding and repeatedly concatenates short continuation lines, causing quadratic CPU consumption on the IOLoop thread. An unauthenticated client can submit a header block containing many obsolete line-folding continuations before application code runs, blocking other connections served by the process. The cost grows with max_header_size, and only availability is affected. This issue is fixed in version 6.6.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; tornadoweb tornado&lt;/p&gt;
&lt;p&gt;Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, Tornado&amp;#39;s HTTP header parser accepts obsolete line folding and repeatedly concatenates short continuation lines, causing quadratic CPU consumption on the IOLoop thread. An unauthenticated client can submit a header block containing many obsolete line-folding continuations before application code runs, blocking other connections served by the process. The cost grows with max_header_size, and only availability is affected. This issue is fixed in version 6.6.&lt;/p&gt;</content:encoded>
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