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      <title>CVE-2026-6879 — Quadratic Behavior in xml.etree.ElementPath Index Predicates</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-6879</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Python Software Foundation CPython&lt;/p&gt;
&lt;p&gt;`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end  of the sibling list, such as with `[last()]` or `[last()-N]`;  `.//item[1]` short-circuits after the first match.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Python Software Foundation CPython&lt;/p&gt;
&lt;p&gt;`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end  of the sibling list, such as with `[last()]` or `[last()-N]`;  `.//item[1]` short-circuits after the first match.&lt;/p&gt;</content:encoded>
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