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    <lastBuildDate>Wed, 07 Oct 2026 21:37:30 +0000</lastBuildDate>
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      <title>CVE-2021-33580 — regex injection leading to DoS</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-33580</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Roller&lt;/p&gt;
&lt;p&gt;User controlled `request.getHeader(&amp;#34;Referer&amp;#34;)`, `request.getRequestURL()` and `request.getQueryString()` are used to build and run a regex expression. The attacker doesn&amp;#39;t have to use a browser and may send a specially crafted Referer header programmatically. Since the attacker controls the string and the regex pattern he may cause a ReDoS by regex catastrophic backtracking on the server side. This problem has been fixed in Roller 6.0.2.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Roller&lt;/p&gt;
&lt;p&gt;User controlled `request.getHeader(&amp;#34;Referer&amp;#34;)`, `request.getRequestURL()` and `request.getQueryString()` are used to build and run a regex expression. The attacker doesn&amp;#39;t have to use a browser and may send a specially crafted Referer header programmatically. Since the attacker controls the string and the regex pattern he may cause a ReDoS by regex catastrophic backtracking on the server side. This problem has been fixed in Roller 6.0.2.&lt;/p&gt;</content:encoded>
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