CVE-2025-46597 - Highly unlikely remote crash on 32-bit systems

<p>Disclosure of the details of a bug on 32-bit systems which may, in a rare edge case, cause the node to crash when receiving a pathological block. This bug would be extremely hard to exploit. A fix was released on October 10th 2025 in Bitcoin Core v30.0.</p> <p>This issue is considered <strong>Low</strong> severity.</p> <h2 id="details">Details</h2> <p>Before writing a block to disk, Bitcoin Core checks that its size is within a normal range. This check would overflow on 32-bit systems for blocks over 1GB, and make the node crash when writing it to disk. Such a block cannot be sent using the <code class="language-plaintext highlighter-rouge">BLOCK</code> message, but could in theory be sen