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0xCERT Security Advisory 0xCERT-2026-0290
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Advisory-ID:  0xCERT-2026-0290
Severity:     Medium
Published:    2026-10-30T20:17:12.640Z
Updated:      2026-10-31T00:08:07.946Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0290

Title: CVE-2026-62335: OpenVM

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, `OpenVmHalo2Verifier.verify` accepts `appExeCommit` and `appVmCommit` as `bytes32` values without checking that either is less than the `BN254` scalar field modulus. Although public-value and proof-data lengths are checked, callers can provide non-canonical 256-bit encodings greater than or equal to that modulus at the Solidity wrapper boundary. Applications relying on the wrapper can therefore accept non-canonical app executable an…

Details
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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, `OpenVmHalo2Verifier.verify` accepts `appExeCommit` and `appVmCommit` as `bytes32` values without checking that either is less than the `BN254` scalar field modulus. Although public-value and proof-data lengths are checked, callers can provide non-canonical 256-bit encodings greater than or equal to that modulus at the Solidity wrapper boundary. Applications relying on the wrapper can therefore accept non-canonical app executable and app VM commitments, creating ambiguity between the supplied byte-level values and the field elements used by the verifier. This issue is fixed in versions 1.7.0, 2.0.0-rc.3 and 2.1.0-preview.

Severity
Medium (CVSS 6.9), as scored by NVD.

Weakness
- - CWE-20

Recommended actions
- - Check whether you run or depend on the affected component and version
- - Apply the vendor's fix or mitigation from the references below

Source & attribution
This 0xCERT advisory summarises CVE-2026-62335 from the U.S. National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2026-62335. Details may change; refer to the original source for the authoritative record.

References
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- - https://nvd.nist.gov/vuln/detail/CVE-2026-62335
- - 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-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/commit/1962276254aabc5420de266a8cb672433ce955ff
- - https://github.com/openvm-org/openvm/pull/152
- - 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

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