---
title: "CVE-2026-62334: OpenVM zkVM - Authentication Bypass"
description: "OpenVM zkVM framework before 1.7.0 (1.x), 2.0 and 2.1 prereleases contains a broken authentication caused by improper verification in OpenVmHalo2Verifier.verify allowing arbitrary app commitments acceptance, letting attackers bypass proof validation, exploit requires crafted proofData with matching external selector."
url: https://panop.io/threat-heartbeat/CVE-2026-62334/
---

# CVE-2026-62334 OpenVM zkVM - Authentication Bypass

OpenVM zkVM framework before 1.7.0 (1.x), 2.0 and 2.1 prereleases contains a broken authentication caused by improper verification in OpenVmHalo2Verifier.verify allowing arbitrary app commitments acceptance, letting attackers bypass proof validation, exploit requires crafted proofData with matching external selector.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.53% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-62334)

## 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-754](https://cwe.mitre.org/data/definitions/754.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-2026-62334](https://nvd.nist.gov/vuln/detail/CVE-2026-62334)
- [https://github.com/openvm-org/openvm/blob/v2.0.0-beta.2/crates/sdk/contracts/template/OpenVmHalo2Verifier.sol](https://github.com/openvm-org/openvm/blob/v2.0.0-beta.2/crates/sdk/contracts/template/OpenVmHalo2Verifier.sol)
- [https://github.com/openvm-org/openvm/blob/v2.1.0-dev.0/crates/sdk/contracts/template/OpenVmHalo2Verifier.sol](https://github.com/openvm-org/openvm/blob/v2.1.0-dev.0/crates/sdk/contracts/template/OpenVmHalo2Verifier.sol)
- [https://github.com/openvm-org/openvm/commit/751bdb1725254c3268782ddf8df89f19035666e3](https://github.com/openvm-org/openvm/commit/751bdb1725254c3268782ddf8df89f19035666e3)
- [https://github.com/openvm-org/openvm/pull/151](https://github.com/openvm-org/openvm/pull/151)
- [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/releases/tag/v2.0.0-rc.3](https://github.com/openvm-org/openvm/releases/tag/v2.0.0-rc.3)
- [https://github.com/openvm-org/openvm/security/advisories/GHSA-j29p-wr24-hp4f](https://github.com/openvm-org/openvm/security/advisories/GHSA-j29p-wr24-hp4f)
- [https://github.com/openvm-org/openvm/blob/v2.0.0-alpha/crates/sdk/contracts/template/OpenVmHalo2Verifier.sol](https://github.com/openvm-org/openvm/blob/v2.0.0-alpha/crates/sdk/contracts/template/OpenVmHalo2Verifier.sol)
- [https://github.com/openvm-org/openvm/releases/tag/v2.1.0-preview](https://github.com/openvm-org/openvm/releases/tag/v2.1.0-preview)

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## 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

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