CVE-2026-73645 ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.
An integer overflow in the confidential total supply tracking allows users to transfer underlying tokens without receiving wrapped tokens, resulting in loss of funds.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73645?
CVE-2026-73645 is a medium-severity vulnerability in openzeppelin-confidential-contracts, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-190
Which versions are affected by CVE-2026-73645?
2 open source packages ship an affected version, including @openzeppelin/confidential-contracts.
| Package | Affected | Fixed in |
|---|---|---|
@openzeppelin/confidential-contracts npm | All versions | 0.3.1 |
@openzeppelin/confidential-contracts npm | All versions | 0.3.1 |
How do I fix CVE-2026-73645?
Upgrade @openzeppelin/confidential-contracts to 0.3.1 or later.
Is CVE-2026-73645 being exploited?
There is no known exploitation of CVE-2026-73645 in the wild and no public exploit code.
Sources
Also known as GHSA-hqf9-8xv5-x8xw.