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      <title>CVE-2025-30218 — Next.js may leak x-middleware-subrequest-id to external hosts</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2025-30218</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; vercel next.js&lt;/p&gt;
&lt;p&gt;Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; vercel next.js&lt;/p&gt;
&lt;p&gt;Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.&lt;/p&gt;</content:encoded>
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