ERC1155Supply vulnerability in OpenZeppelin Contracts
When ERC1155 tokens are minted, a callback is invoked on the receiver of those tokens, as required by the spec. When including the ERC1155Supply extension, total supply is not updated until after the callback, thus during the callback the reported total supply is lower than the real number of tokens in circulation.
Impact
If a system relies on accurately reported supply, an attacker may be able to mint tokens and invoke that system after receiving the token balance but before the supply is updated.
Patches
A fix is included in version 4.3.3 of @openzeppelin/contracts and @openzeppelin/contracts-upgradeable.
Workarounds
If accurate supply is relevant, do not mint tokens to untrusted receivers.
Credits
The issue was identified and reported by @ChainSecurityAudits.
For more information
Read TotalSupply Inconsistency in ERC1155 NFT Tokens by @ChainSecurityAudits for a more detailed breakdown.
If you have any questions or comments about this advisory, email us at security@openzeppelin.com.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @openzeppelin/contracts | >= 4.2.0, < 4.3.3 | 4.3.3 |
| npm package | @openzeppelin/contracts-upgradeable | >= 4.2.0, < 4.3.3 | 4.3.3 |
References
- Weakness (CWE)
-- Platform
- npm
- Package
@openzeppelin/contracts, @openzeppelin/contracts-upgradeable- Disclosed
- 15.11.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-wmpv-c2jp-j2xg - CC BY 4.0
Vulnerability history: @openzeppelin/contracts
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 20
- First → latest
- 08.2021 07.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 5
- Medium 12
- Low 1
Disclosures per year
- 2021: 4
- 2022: 7
- 2023: 7
- 2024: 1
- 2025: 1
- 2026: 0
-
ERC1155Supply vulnerability in OpenZeppelin Contracts this entry
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