4 matches found
EUVD-2026-65142
The Lean 4 kernel does not check that the body of an opaque declaration is closed. environment::addopaque omits the checknometavarnofvar call that the definition and theorem paths perform, so a value containing a free variable that is absent from the local context is not rejected outright. A...
CVE-2026-72844
CVE-2026-72844 is a kernel soundness break in Lean 4 , the theorem prover. The root cause is a missing type check in environment::add_inductive (src/kernel/inductive.cpp): nested inductive applications replaced by auxiliary types had their parametric arguments unchecked, and the kernel did not ve...
CVE-2026-72844 Lean 4 Kernel Type Checking Bypass via Mismatched Structure Projections
The Lean 4 kernel does not verify that the structure named in a projection expression matches the type of the value being projected, and environment::addinductive in src/kernel/inductive.cpp did not type check the nested inductive applications that are replaced by auxiliary types, so their...
