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 ...

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 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

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...

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...

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...

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 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...

PT-2026-79074

Name of the Vulnerable Software and Affected Versions Lean 4 affected versions not specified Description The kernel fails to verify that the structure named in a projection expression matches the type of the value being projected. Additionally, the environment::add inductive function in...

CVE-2026-72844: Access of Resource Using Incompatible Type

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...

MAL-2026-6797 Malicious code in mongoose-lean-hooks (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 540ace1cb8bc936ea953554a9ffc28203370f82cb5e5a7dfbf1454bf0e834b9a On require'mongoose-lean-hooks', the package's main entry index.js runs a top-level async IIFE that issues an HTTP GET to...

Malicious code in mongoose-lean-hooks (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 540ace1cb8bc936ea953554a9ffc28203370f82cb5e5a7dfbf1454bf0e834b9a On require'mongoose-lean-hooks', the package's main entry index.js runs a top-level async IIFE that issues an HTTP GET to...