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    <lastBuildDate>Sun, 04 Oct 2026 06:19:04 +0000</lastBuildDate>
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      <title>CVE-2026-44593 — esm.sh: Legacy Route Path Traversal Can Lead to RCE</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-44593</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; esm-dev esm.sh&lt;/p&gt;
&lt;p&gt;esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, the legacy router first retrieves a response from legacyServer, parses the incoming request path, and ultimately writes the data to storage via buildStorage.Put. The router concatenates the path components without sanitizing them, producing a storage key. When this key is used, the underlying file system resolves the relative segments and writes the file to the specified path. Thus an attacker can craft a request that writes data to arbitrary locations on the server.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; esm-dev esm.sh&lt;/p&gt;
&lt;p&gt;esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, the legacy router first retrieves a response from legacyServer, parses the incoming request path, and ultimately writes the data to storage via buildStorage.Put. The router concatenates the path components without sanitizing them, producing a storage key. When this key is used, the underlying file system resolves the relative segments and writes the file to the specified path. Thus an attacker can craft a request that writes data to arbitrary locations on the server.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-44593</guid>
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