---
id: CVE-2026-73645
title: >-
  OpenZeppelin Confidential Contracts is an experimental library for developing
  applications on the Zama fhEVM
summary: >-
  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…
severity: none
cwe:
  - CWE-190
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73645'
references:
  - url: >-
      https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/commit/c620d4386021dde63ae3ea1507dee8543791134a
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/271
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/releases/tag/v0.3.1
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/security/advisories/GHSA-hqf9-8xv5-x8xw
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00384
epssPercentile: 0.323
ingestedAt: '2026-09-18T20:51:25.608Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.