--- title: "CVE-2026-62333: OpenVM - Authentication Bypass" description: "OpenVM before 1.7.0 (1.x), 2.0.0-rc.3, and 2.1.0-preview contains a broken authentication caused by improper Merkle expansion row validation in MemoryMerkleAir, letting malicious provers alter committed memory roots without memory operations, exploit requires crafted Merkle subtree manipulation." url: https://panop.io/threat-heartbeat/CVE-2026-62333/ --- # CVE-2026-62333 OpenVM - Authentication Bypass OpenVM before 1.7.0 (1.x), 2.0.0-rc.3, and 2.1.0-preview contains a broken authentication caused by improper Merkle expansion row validation in MemoryMerkleAir, letting malicious provers alter committed memory roots without memory operations, exploit requires crafted Merkle subtree manipulation. CVSS base score 8.7 /10 High CISA KEV Not listed Public exploit None known EPSS 0.40% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-62333) ## Details Type Authentication Bypass Impact Broken Authentication CVSS vector 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 Published 30 October 2026 Updated 1 November 2026 Weakness [CWE-20](https://cwe.mitre.org/data/definitions/20.html) ## Vendor fix Update to versions 1.7.0, 2.0.0-rc.3, or 2.1.0-preview or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-62333](https://nvd.nist.gov/vuln/detail/CVE-2026-62333) - [https://github.com/openvm-org/openvm/releases/tag/v2.1.0-preview](https://github.com/openvm-org/openvm/releases/tag/v2.1.0-preview) - [https://github.com/openvm-org/openvm/security/advisories/GHSA-396x-v8w4-9x82](https://github.com/openvm-org/openvm/security/advisories/GHSA-396x-v8w4-9x82) - [https://github.com/openvm-org/openvm/commit/bb123f6073691bd2b794171c594264c77e45c376](https://github.com/openvm-org/openvm/commit/bb123f6073691bd2b794171c594264c77e45c376) - [https://github.com/openvm-org/openvm/releases/tag/v1.7.0](https://github.com/openvm-org/openvm/releases/tag/v1.7.0) - [https://github.com/openvm-org/openvm/blob/v2.0.0-alpha/crates/vm/src/system/memory/merkle/air.rs](https://github.com/openvm-org/openvm/blob/v2.0.0-alpha/crates/vm/src/system/memory/merkle/air.rs) - [https://github.com/openvm-org/openvm/blob/v2.0.0-beta.2/crates/vm/src/system/memory/merkle/air.rs](https://github.com/openvm-org/openvm/blob/v2.0.0-beta.2/crates/vm/src/system/memory/merkle/air.rs) - [https://github.com/openvm-org/openvm/blob/v2.1.0-dev.0/crates/vm/src/system/memory/merkle/air.rs](https://github.com/openvm-org/openvm/blob/v2.1.0-dev.0/crates/vm/src/system/memory/merkle/air.rs) - [https://github.com/openvm-org/openvm/pull/148](https://github.com/openvm-org/openvm/pull/148) - [https://github.com/openvm-org/openvm/releases/tag/v2.0.0-rc.3](https://github.com/openvm-org/openvm/releases/tag/v2.0.0-rc.3) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)