BTC High-Risk Vulnerability 43% of Nodes Worldwide Are at Risk

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Bitcoin Core officially discloses the high-severity vulnerability CVE-2024-52911, affecting multiple mainstream versions from 0.14.1 to 28.4. Globally, 43% of Bitcoin full nodes are still running outdated versions with the vulnerability, directly exposing them to attack risks.

It’s not an ordinary minor bug, but one that allows miners to craft special blocks to remotely crash other nodes, and in severe cases, execute code. Simply put, as long as nodes are not upgraded, attackers can broadcast malicious blocks to paralyze nodes, posing a significant threat to the stable operation of the decentralized network.

Many will ask, with such a serious vulnerability, why is it only now being disclosed?

In fact, the entire process was completed long ago. The vulnerability was discovered by developer Cory Fields as early as November 2024, and was privately reported according to industry standards. The team quickly completed the fix, merged the code in December 2024, and officially released version 29 in April 2025, fully patching the flaw. By April 19, 2026, the last remaining vulnerable 28.x series versions have officially ceased maintenance and no longer receive security support.

The reason nearly half of the nodes remain at risk is mainly because: Bitcoin full node upgrades are entirely voluntary, with no mandatory requirements. Many node operators find their software stable and are reluctant to update, and they did not promptly follow security notices until the vulnerability was publicly disclosed, realizing the risk only then.

Ordinary coin holders who only use exchanges and light wallets are generally unaffected and need not panic excessively; the real concern is for users who run and maintain their own Bitcoin full nodes.

The vulnerability details are now fully public, and the potential attack risk has shifted from latent to apparent. Do not hold onto false hope. If your node version is below v29, upgrade as soon as possible—this is the simplest and most effective way to avoid risk. The security of the Bitcoin network has always depended on each node being maintained in a timely manner.

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