Bitcoin Core quietly patched memory bug, but 43% of nodes may still be at risk

Bitcoin Core, the client for running a full Bitcoin node, has revealed that it quietly patched a memory stability bug that could have been used to attack miners. According to The Block, the Core team included the bug fix in version 29.0, which was released in April of last year. Support for the vulnerable 28.x version was discontinued on April 19, 2026. The Block noted that the bug was limited to a memory handling issue in the node software and did not affect the Bitcoin consensus algorithm or allow for on-chain changes. However, it warned that a security risk remains, as approximately 43% of Bitcoin nodes may still be running software older than version 29.