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CVE-2026-72844: Access of Resource Using Incompatible Type ('Type Confusion') in leanprover lean4CVE-2026-72844 0 CVE-2026-72844 is a type confusion vulnerability in the Lean 4 kernel that allows a metaprogram running within the Lean process to register an ill-typed nested inductive declaration. This occurs because the kernel does not verify that the structure named in a projection expression matches the type of the value being projected, and certain nested inductive applications escape type checking. Exploitation can lead to a proof of False without axioms, enabling derivation of any proposition. The vulnerability requires running a metaprogram in-process, such as by building a project or importing a malicious dependency. Join the discussion | CVE Database V5 | 08/20/2026, 17:19:34 UTC Added: 08/20/2026, 17:38:51 UTC |
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