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Bitcoin Core discloses low-severity undo file overflow bug, fixes in four releases

Bitcoin Core disclosed details of a bug that lets a miner corrupt other nodes' undo data, causing them to shut down if a reorg of precisely the right blocks follows, or on Windows and 32-bit systems as soon as the affected blocks are connected. The project said it is impractical to exploit and rated it Low severity and easily discoverable. A fix for 64-bit systems was released in Bitcoin Core versions 29.5, 30.4, 31.2 and 32.1, while 32-bit systems and nodes storing blocks on FAT32 remain affected.

Why “Confirmed”

  • Published by a primary source: Bitcoin Core

1 independent source group across 1 post · evidence score 90/100. How labels work

Market around the story

AssetPrice at first report6h before1h before1h after6h after1h move vs normal24h volume vs median
BTC $81,030 +0.25% +0.23% −0.18% +0.51% 0.5σ 0.9×

Returns are measured from the moment the story first appeared. “vs normal” compares the move with the asset's typical hourly move over the previous 30 days.

What the sources claim

  1. Bitcoin Core disclosed a bug that lets a miner corrupt other nodes' undo data and cause them to shut down under specific reorg conditions. BTC

    “a bug that lets a miner corrupt the undo data of other nodes, causing them to shut down”
    Bitcoin Core

  2. The bug is considered impractical to exploit and rated Low severity and easily discoverable. BTC

    “It is impractical to exploit.”
    Bitcoin Core

  3. A fix for 64-bit systems was released in Bitcoin Core versions 29.5, 30.4, 31.2 and 32.1. BTC

    “A fix for 64-bit systems was released in Bitcoin Core versions 29.5, 30.4, 31.2 and 32.1.”
    Bitcoin Core

  4. 32-bit systems and nodes storing blocks on FAT32 remain affected by the issue. BTC

    “32-bit systems and nodes storing blocks on FAT32 remain affected.”
    Bitcoin Core

  5. Undo files have no size limit and positions within them were stored as 32-bit integers, allowing a single undo file to be pushed past 4 GiB. BTC

    “undo files have no size limit, and positions within them were stored as 32-bit integers”
    Bitcoin Core

Sources

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Summary and claims extracted by AI with prompt analyze-story@5 on 2026-10-28 18:20 UTC. Labels are computed from the sources, not by the model.