OpenZeppelin Confidential Contracts up to 0.3.0 ERC7984ERC20Wrapper ERC7984ERC20Wrapper.sol wrap/onTransferReceived integer overflow

Summaryinfo

A vulnerability was found in OpenZeppelin Confidential Contracts up to 0.3.0. It has been rated as problematic. This impacts the function wrap/onTransferReceived of the file contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol of the component ERC7984ERC20Wrapper. Performing a manipulation results in integer overflow. This vulnerability is cataloged as CVE-2026-73645. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in OpenZeppelin Confidential Contracts up to 0.3.0. This affects the function wrap/onTransferReceived of the file contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol of the component ERC7984ERC20Wrapper. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-73645 since 08/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.3.1 eliminates this vulnerability.

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Productinfo

Vendor

• OpenZeppelin

Name

• Confidential Contracts

Version

• 0.1
• 0.2
• 0.3.0

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CPE 2.2info

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