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    <lastBuildDate>Mon, 28 Sep 2026 21:37:16 +0000</lastBuildDate>
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      <title>CVE-2026-33169 — Rails Active Support has a possible ReDoS vulnerability in number_to_delimited</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-33169</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; rails activesupport&lt;/p&gt;
&lt;p&gt;Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; rails activesupport&lt;/p&gt;
&lt;p&gt;Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.&lt;/p&gt;</content:encoded>
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