lean-cve-poc

CVE-2026-72844: Lean 4 Kernel Soundness Bug Proving0 = 1 axiom-free via nested inductive projection validation bypass. Field| Value ---|--- CVE| CVE-2026-72844 Advisory| VulnCheck VCSA Bug report| leanprover/lean414576 Fix| leanprover/lean414577 Affected| Lean 4 ≤ v4.31.0 / nightly ≤ 2026-07-27...

break-golf

break-golf A board for cryptanalysis results that are proved , not run. A challenge fixes two worlds and the statement you must prove. You write an adversary and a proof that it distinguishes them. The win is the proof: nothing is executed, sampled, or replayed, and no human reads the submission ...

lean-cve-poc-14484

CVE-2026-72711 — Lean 4 Kernel Soundness Bug: Inference Cache Poisoning Proving0 = 1 axiom-free via opaque declaration FVar cache poisoning. Field| Value ---|--- Bug report| leanprover/lean414484 Fix| leanprover/lean414498 Affected| Lean 4 ≤ v4.31.0 / all prior versions Fixed in| nightly...

Lean 4.31.0 Kernel Type Confusion Proof of Concept

Lean 4 version 4.31.0 and earlier contain a kernel soundness vulnerability involving insufficient validation of nested inductive type projections. A malicious metaprogram can exploit mismatched structure projections and expression hash collisions to register ill-typed declarations through the...

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Lean 4 version 4.31.0 and earlier contain a kernel soundness vulnerability caused by improper validation of opaque declarations and stale free-variable inference-cache entries. A malicious metaprogram can exploit the missing closure check in the addopaque path to register an opaque constant of ty...

Quantum Cryptography and Autoformalization in Lean

Quantum key distribution provides secure communication by relying on physics principles and mathematical reasoning. Security proofs across the field can contain gaps, often between individually valid theorems integrated under mismatched assumptions. We produce an end-to-end security theorem...

Malicious code in lean-coffee (npm)

Source: ossf-package-analysis 40091a9e1c992e1036913597e929c36c5b56682d022e7260f42badcc3705df8c The OpenSSF Package Analysis project identified 'lean-coffee' @ 9.0.1 npm as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. -...

CVE-2026-72711

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-2026-65142

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-2026-72711 Lean 4 before 4.32.2 Kernel Accepts Opaque Declaration With an Unbound Free Variable

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-2026-72711 Lean 4 before 4.32.2 Kernel Accepts Opaque Declaration With an Unbound Free Variable

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-2026-72711 Lean 4 before 4.32.2 Kernel Accepts Opaque Declaration With an Unbound Free Variable

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-2026-72711

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-2026-72711

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...

PT-2026-81020

The Lean 4 kernel does not check that the body of an opaque declaration is closed. environment::add opaque omits the check no metavar no fvar 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-2026-72711: Improper Input Validation

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

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...

EUVD-2026-63487

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...

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...

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...