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Lean ships with verified kernels
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Lean ships with verified kernels

The gist

Lean author Leonardo de Moura says Lean v4.35.0 ships with four additional kernels and a `lake check --paranoid` recheck command.
The release follows two kernel soundness bug postmortems.

How it unfolded

  1. Aug 1, 2026A postmortem is published for kernel soundness bug 14576.
  2. Aug 24, 2026A postmortem is published for the kernel soundness bug hunt.
  3. Oct 15, 2026Leonardo de Moura publishes the blog post "Lean Now Ships with Verified Kernels".

Sources

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