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  <updated>2026-09-28T21:09:09.728129+00:00</updated>
  <author>
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    <email>info@circl.lu</email>
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  <entry>
    <id>https://vulnerability.circl.lu/vuln/cve-2026-27904</id>
    <title>CVE-2026-27904 — minimatch ReDoS: nested *() extglobs generate catastrophically backtracking regular expressions</title>
    <updated>2026-09-28T21:09:11.163536+00:00</updated>
    <content type="xhtml">
      <div xmlns="http://www.w3.org/1999/xhtml"><p><strong>Affected:</strong> isaacs minimatch</p>
<p>minimatch is a minimal matching utility for converting glob expressions into JavaScript RegExp objects. Prior to version 10.2.3, 9.0.7, 8.0.6, 7.4.8, 6.2.2, 5.1.8, 4.2.5, and 3.1.4, nested `*()` extglobs produce regexps with nested unbounded quantifiers (e.g. `(?:(?:a|b)*)*`), which exhibit catastrophic backtracking in V8. With a 12-byte pattern `*(*(*(a|b)))` and an 18-byte non-matching input, `minimatch()` stalls for over 7 seconds. Adding a single nesting level or a few input characters pushes this to minutes. This is the most severe finding: it is triggered by the default `minimatch()` API with no special options, and the minimum viable pattern is only 12 bytes. The same issue affects `+()` extglobs equally. Versions 10.2.3, 9.0.7, 8.0.6, 7.4.8, 6.2.2, 5.1.8, 4.2.5, and 3.1.4 fix the issue.</p></div>
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    <link href="https://vulnerability.circl.lu/vuln/cve-2026-27904"/>
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