CVE-2023-26488 OpenZeppelin Contracts contains Incorrect Calculation

Medium 6.5 Published 3 Mar 2023 Updated 25 Feb 2025

Incorrect balance calculation in ERC721Consecutive allows subsequent transfers to overflow reported balances, affecting smart contract developers using OpenZeppelin Contracts.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-26488?

CVE-2023-26488 is a medium-severity vulnerability in openzeppelin-contracts, published on 3 Mar 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

OpenZeppelin Contracts is a library for secure smart contract development. The ERC721Consecutive contract designed for minting NFTs in batches does not update balances when a batch has size 1 and consists of a single token. Subsequent transfers from the receiver of that token may overflow the balance as reported by `balanceOf`. The issue exclusively presents with batches of size 1. The issue has been patched in 4.8.2.

Weakness: CWE-682

Which versions are affected by CVE-2023-26488?

4 open source packages ship an affected version, including @openzeppelin/contracts and @openzeppelin/contracts-upgradeable. It affects 2 products.

Package	Affected	Fixed in
`@openzeppelin/contracts` npm	From `4.8.0`	`4.8.2`
`@openzeppelin/contracts` npm	From `4.8.0`	`4.8.2`
`@openzeppelin/contracts-upgradeable` npm	From `4.8.0`	`4.8.2`
`@openzeppelin/contracts-upgradeable` npm	From `4.8.0`	`4.8.2`

Products include Openzeppelin Contracts, Openzeppelin Contracts Upgradeable.

How do I fix CVE-2023-26488?

Upgrade @openzeppelin/contracts to 4.8.2 or later.

Is CVE-2023-26488 being exploited?

There is no known exploitation of CVE-2023-26488 in the wild and no public exploit code.

Sources

Also known as GHSA-878m-3g6q-594q.