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      <title>CVE-2021-43838 — Regular Expression Denial of Service (ReDoS) in jsx-slack</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-43838</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; yhatt jsx-slack&lt;/p&gt;
&lt;p&gt;jsx-slack is a library for building JSON objects for Slack Block Kit surfaces from JSX. In versions prior to 4.5.1 users are vulnerable to a regular expression denial-of-service (ReDoS) attack. If attacker can put a lot of JSX elements into `&amp;lt;blockquote&amp;gt;` tag, an internal regular expression for escaping characters may consume an excessive amount of computing resources. jsx-slack v4.5.1 has patched to a regex for escaping blockquote characters. Users are advised to upgrade as soon as possible.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; yhatt jsx-slack&lt;/p&gt;
&lt;p&gt;jsx-slack is a library for building JSON objects for Slack Block Kit surfaces from JSX. In versions prior to 4.5.1 users are vulnerable to a regular expression denial-of-service (ReDoS) attack. If attacker can put a lot of JSX elements into `&amp;lt;blockquote&amp;gt;` tag, an internal regular expression for escaping characters may consume an excessive amount of computing resources. jsx-slack v4.5.1 has patched to a regex for escaping blockquote characters. Users are advised to upgrade as soon as possible.&lt;/p&gt;</content:encoded>
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