CVE-2026-62333 json
OpenVM: MemoryMerkleAir allows below-leaf rows to alter memory roots
published 4mo ago modified 7d ago also EUVD-2026-114442 , GHSA-396x-v8w4-9x82
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository openvm-org/openvm. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 8.7
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- openvm openvm 1.7.0, 2.0.0-rc.3, 2.1.0-preview
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- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7d ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- openvm-org openvm
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
- github.com /openvm-org/openvm/pull/148
- github.com /openvm-org/openvm/commit/bb123f6073691bd2b794171c594264c77e45c376
-
github.com
/openvm-org/openvm/security/advisories/GHSA-396x-v8w4-9x82
advisory
- github.com /openvm-org/openvm/blob/v2.0.0-alpha/crates/vm/src/system/memory/merkle/air.rs
- github.com /openvm-org/openvm/blob/v2.0.0-beta.2/crates/vm/src/system/memory/merkle/air.rs
- github.com /openvm-org/openvm/blob/v2.1.0-dev.0/crates/vm/src/system/memory/merkle/air.rs
- github.com /openvm-org/openvm/releases/tag/v1.7.0
- github.com /openvm-org/openvm/releases/tag/v2.0.0-rc.3
- github.com /openvm-org/openvm/releases/tag/v2.1.0-preview
Sources
- CVE List CVE-2026-62333
- NVD CVE-2026-62333
- Maintainer advisory GHSA-396x-v8w4-9x82
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of openvm-org/openvm published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.