Lean 4 kernel accepts false proofs via opaque declarations (CVE-2026-72711)
A checked proof of False, including 0 = 1, passes the Lean 4 kernel at --trust=0 without axioms or unsafe features.
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A checked proof of False, including 0 = 1, passes the Lean 4 kernel at --trust=0 without axioms or unsafe features.
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