OpenZeppelin Confidential Contracts is an experimental library for developing applications on the Zama fhEVM. Prior to 0.3.1, the ERC7984 contract tracked confidential total supply with an euint64 value, and an overflowing internal _mint operation could fail silently. The wrap and onTransferReceived functions in contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol did not handle that failure, so a user could transfer the underlying token without receiving the corresponding confidential wrapped token. With the default rate(), the wrapper fills after approximately 18.4 trillion tokens, and subsequent wrapping requests can cause loss of funds. This issue is fixed in version 0.3.1.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
OpenZeppelin openzeppelin-confidential-contracts affected
Version Status Constraints
< 0.3.1 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-hqf9-8xv5-x8xw ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/commit/c620d4386021dde63ae3ea1507dee8543791134a cve-icon cve-icon
https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/271 cve-icon cve-icon
https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/releases/tag/v0.3.1 cve-icon cve-icon
https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/security/advisories/GHSA-hqf9-8xv5-x8xw cve-icon cve-icon
History

Thu, 13 Aug 2026 18:15:00 +0000

Type Values Removed Values Added
Description OpenZeppelin Confidential Contracts is an experimental library for developing applications on the Zama fhEVM. Prior to 0.3.1, the ERC7984 contract tracked confidential total supply with an euint64 value, and an overflowing internal _mint operation could fail silently. The wrap and onTransferReceived functions in contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol did not handle that failure, so a user could transfer the underlying token without receiving the corresponding confidential wrapped token. With the default rate(), the wrapper fills after approximately 18.4 trillion tokens, and subsequent wrapping requests can cause loss of funds. This issue is fixed in version 0.3.1.
Title OpenZeppelin Confidential Contracts ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.
Weaknesses CWE-190
References
Metrics cvssV4_0

{'score': 6.6, '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:U'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-13T17:54:42.793Z

Reserved: 2026-08-13T14:04:09.604Z

Link: CVE-2026-73645

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-13T18:18:20.277

Modified: 2026-08-13T18:18:20.277

Link: CVE-2026-73645

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T19:45:17Z

Weaknesses