CVE-2023-26488: Openzeppelin Contracts

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Openzeppelin Contracts: from 4.8.0, before 4.8.2 (fixed in 4.8.2)
• Openzeppelin Contracts Upgradeable: from 4.8.0, before 4.8.2 (fixed in 4.8.2)

Published 2023-03-03. Last modified 2026-06-17.