Intel

CVE-2026-73645

@openzeppelin/confidential-contracts: Integer Overflow or Wraparound (CVE-2026-73645)

mediumEPSS 0.5%

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: NVD (NIST)cvelistv5CVE.org (MITRE)OSV (Open Source Vulnerabilities)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

npm@openzeppelin/confidential-contracts

Metrics

XIEM Effective CVSS
6.6
Source: cna-v4
EPSS percentile
42.7 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
medium
Priority score
72.82
Exploit maturity
no public PoC known
CVSS v4
6.6
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-08-13 18:18 UTC
CWE
CWE-190

Weakness classes (CWE)

  • CWE-190Base

    Integer Overflow or Wraparound

    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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

    cwe.mitre.org →

References & sources