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  <updated>2026-09-28T21:37:19.374540+00:00</updated>
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    <email>info@circl.lu</email>
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  <entry>
    <id>https://vulnerability.circl.lu/vuln/cve-2026-21716</id>
    <title>CVE-2026-21716</title>
    <updated>2026-09-28T21:37:19.377313+00:00</updated>
    <content type="xhtml">
      <div xmlns="http://www.w3.org/1999/xhtml"><p><strong>Affected:</strong> nodejs node</p>
<p>An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`) were correctly patched.

As a result, code running under `--permission` with restricted `--allow-fs-write` can still use promise-based `FileHandle` methods to modify file permissions and ownership on already-open file descriptors, bypassing the intended write restrictions.

This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted.</p></div>
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    <link href="https://vulnerability.circl.lu/vuln/cve-2026-21716"/>
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