CVE-2026-72705

A flaw was found in Rocq Prover. The guard checker component fails to properly track recursive calls when a fixpoint passes itself as a higher-order argument to another fixpoint. This oversight allows for the creation of a type that is logically equivalent to its own negation, which can lead to t...

CVE-2026-72703

A flaw was found in Rocq Prover. The guard checker incorrectly processes parameters of nested mutual fixpoints when cross-calls occur between different bodies of the fixpoint. This oversight allows the system to accept non-terminating definitions as structurally decreasing. This critical logical...

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...

EUVD-2026-65143

Rocq Prover does not restore the universe graph's copy of the universe checking flag when a module that locally disabled the check is closed. Local Unset Universe Checking inside a module is expected to last only until the module ends, and the global flag is restored, but the universe graph keeps...

CVE-2026-72714

Rocq Prover (through 9.2.0) contains a state desynchronization in its universe checking mechanism. When a module that locally disabled the universe checking flag is closed, the global flag is restored but the universe graph retains its own copy left disabled . The kernel then accepts universe-inc...

CVE-2026-72711

CVE-2026-72711 is a kernel soundness flaw in Lean 4 before 4.32.2. The function environment::add_opaque omits the check_no_metavar_no_fvar closure check that the definition and theorem paths perform. A metaprogram can exploit a stale entry in the type checker's inference cache to submit an opaque...