CVE-2026-62333

The OpenVM zkVM framework is vulnerable to a flaw in the MemoryMerkleAir component (versions before 1.7.0 in the 1.x line, and affected 2.0 and 2.1 prereleases). The root cause is the failure to forbid Merkle expansion rows at parent_height $\le$ 0 when expand_direction is non-zero. This allows a...

CVE-2026-62333 OpenVM: MemoryMerkleAir allows below-leaf rows to alter memory roots

OpenVM is a performant and modular zkVM framework built for customization and extensibility. Before 1.7.0 in the 1.x line and in affected 2.0 and 2.1 prereleases, MemoryMerkleAir does not forbid Merkle expansion rows at parentheight = 0 or below while expanddirection != 0. A malicious prover can...

CVE-2026-62333: openvm-org openvm: OpenVM is a performant and modular zkVM framework built for customization and extensibility

OpenVM is a performant and modular zkVM framework built for customization and extensibility. Before 1.7.0 in the 1.x line and in affected 2.0 and 2.1 prereleases, MemoryMerkleAir does not forbid Merkle expansion rows at parentheight = 0 or below while expanddirection != 0. A malicious prover can...