Vulnerability Description
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 `parent_height` = 0 or below while `expand_direction` != 0. A malicious prover can fabricate a subtree below a memory leaf and swap digests inside that subtree to change the committed memory root without a corresponding memory operation. The fraudulent rows still balance against the Merkle and compression buses and require no memory-bus operation for the changed leaf. Because the memory Merkle root binds VM memory state across continuation segment boundaries, this affects the soundness of OpenVM proofs using persistent memory. This issue is fixed in versions 1.7.0, 2.0.0-rc.3 and 2.1.0-preview.
Related Weaknesses (CWE)
References
- https://github.com/openvm-org/openvm/blob/v2.0.0-alpha/crates/vm/src/system/memo
- https://github.com/openvm-org/openvm/blob/v2.0.0-beta.2/crates/vm/src/system/mem
- https://github.com/openvm-org/openvm/blob/v2.1.0-dev.0/crates/vm/src/system/memo
- https://github.com/openvm-org/openvm/commit/bb123f6073691bd2b794171c594264c77e45
- https://github.com/openvm-org/openvm/pull/148
- https://github.com/openvm-org/openvm/releases/tag/v1.7.0
- https://github.com/openvm-org/openvm/releases/tag/v2.0.0-rc.3
- https://github.com/openvm-org/openvm/releases/tag/v2.1.0-preview
- https://github.com/openvm-org/openvm/security/advisories/GHSA-396x-v8w4-9x82
FAQ
What is CVE-2026-62333?
CVE-2026-62333 is a documented vulnerability. 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 Mer...
How severe is CVE-2026-62333?
CVSS scoring is not yet available for CVE-2026-62333. Check NVD for updates.
Is there a patch for CVE-2026-62333?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.