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importantSYS.SOURCE: Leonardo de Moura's Blog• 2026-08-01T18:32:20Z

Postmortem Analysis of Kernel Soundness Bug #14576 in Lean Proof Assistant

#lean#kernel#soundness#metaprogramming

A soundness bug in the Lean kernel (issue #14576) was exploited via metaprogramming to create a disproof of the Collatz conjecture, leading to a rapid fix and analysis of related vulnerabilities in auxiliary checkers like nanoda. The incident highlighted the importance of independent verification and reinforced the need for kernel-level type safety despite untrusted elaboration components.

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