CVE-2025-62491

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>quickjs-ng</name>
	<range><lt>2025-09-13</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>A Use-After-Free (UAF) vulnerability exists in the QuickJS engine's
	standard library when iterating over the global list of unhandled
	rejected promises (ts->rejected_promise_list).

  *  The function
	js_std_promise_rejection_check attempts to iterate over the
	rejected_promise_list to report unhandled rejections using a standard
	list loop.


  *  The reason for a promise rejection is processed
	inside the loop, including calling js_std_dump_error1(ctx,
	rp->reason).


  *  If the promise rejection reason is an Error object
	that defines a custom property getter (e.g., via
	Object.defineProperty), this getter is executed during the error
	dumping process.


  *  The malicious custom getter can execute
	JavaScript code that calls catch() on the same rejected promise being
	processed.


  *  Calling catch() internally triggers
	js_std_promise_rejection_tracker, which then removes and frees the
	current promise entry (JSRejectedPromiseEntry) from the
	rejected_promise_list.


  *  Since the list iteration continues using
	the now-freed memory pointer (el), the subsequent loop access results
	in a Use-After-Free condition.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2025-62491</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2025-62491</url>
    </references>
    <dates>
      <discovery>2025-10-16</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>