What’s Vulnerable › Vulnerabilities

CVE-2023-49798: Duplicated execution of subcalls in OpenZeppelin Contracts

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-09 · updated 2026-06-17
• Weakness: CWE-670

Description

OpenZeppelin Contracts is a library for smart contract development. A merge issue when porting the 5.0.1 patch to the 4.9 branch caused a line duplication. In the version of `Multicall.sol` released in `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4`, all subcalls are executed twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers. The duplicated delegatecall was removed in version 4.9.5. The 4.9.4 version is marked as deprecated. Users are advised to upgrade. There are no known workarounds for this issue.

Affected products

• openzeppelin-contracts: 4.9.4
• OpenZeppelin Contracts Upgradeable: 4.9.4

References

• https://github.com/OpenZeppelin/openzeppelin-contracts/commit/88ac712e06832bce73b41e8166cded2729e25205
• https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-699g-q6qh-q4v8
• https://github.com/OpenZeppelin/openzeppelin-contracts/commit/88ac712e06832bce73b41e8166cded2729e25205
• https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-699g-q6qh-q4v8

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