CVE-2024-4435

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It was discovered recently that when we deallocate a node, in some cases only the first memory chunk is deallocated, and the rest of the memory chunks remain (incorrectly) allocated, causing a memory leak. In the worst case, depending on how a canister uses the <code>BTreeMap</code>, an adversary could interact with the canister through its API and trigger interactions with the map that keep consuming memory due to the memory leak. This could potentially lead to using an excessive amount of memory, or even running out of memory.</p><p>This issue has been fixed in <a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/dfinity/stable-structures/pull/212\">#212</a>&nbsp;by changing the logic for deallocating nodes to ensure that all of a node's memory chunks are deallocated <span style=\"background-color: rgb(255, 255, 255);\">and users are asked to upgrade to version </span><code>0.6.4</code><span style=\"background-color: rgb(255, 255, 255);\">.</span>. 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Esto podr\u00eda llevar potencialmente al uso de una cantidad excesiva de memoria o incluso a quedarse sin memoria. Este problema se solucion\u00f3 en el n.\u00ba 212 https://github.com/dfinity/stable-structures/pull/212 cambiando la l\u00f3gica para desasignar nodos para garantizar que todos los fragmentos de memoria de un nodo se desasignen y se solicite a los usuarios que actualicen a versi\u00f3n 0.6.4.. Se han agregado pruebas para evitar que avancen regresiones de esta naturaleza. Nota: Los usuarios de estructura estable &lt;0.6.0 no se ven afectados. Los usuarios que no almacenan tipos ilimitados en BTreeMap no se ven afectados y no necesitan actualizar. 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