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CVE-2026-73645— OpenZeppelin Confidential Contracts ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.

Quick assessment

Affected
OpenZeppelin openzeppelin-confidential-contracts
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenZeppelin Confidential Contracts 是一个用于在 Zama fhEVM 上开发应用程序的实验性库。在 0.3.1 版本之前，ERC7984 合约使用一个 euint64 类型的值来跟踪机密总供应量（confidential total supply），而内部的 _mint 操作在发生溢出时可能会静默失败。contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol 中的 wrap 和 onTransferReceived 函

CVSS 6.6 · Medium EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenZeppelin openzeppelin-confidential-contracts < 0.3.1 affected
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I. Basic Information for CVE-2026-73645

Vulnerability Information
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Vulnerability Title
OpenZeppelin Confidential Contracts ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenZeppelin openzeppelin-confidential-contracts < 0.3.1 -

II. Public POCs for CVE-2026-73645

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III. Intelligence Information for CVE-2026-73645

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Patches & Fixes for CVE-2026-73645 (2)

Vendor Advisories for CVE-2026-73645 (1)

Vendor Pages for CVE-2026-73645 (1)

IV. Related Vulnerabilities

Same vendor: OpenZeppelin
Same weakness: CWE-190

V. Comments for CVE-2026-73645

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