UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### Impact Upgradeable contracts using `UUPSUpgradeable` may be vulnerable to an attack affecting uninitialized implementation contracts. We will update this advisory with more information soon. ### Patches A fix is included in version 4.3.2 of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`. ### Workarounds Initialize implementation contracts using `UUPSUpgradeable` by invoking the initializer function (usually called `initialize`). An example is provided [in the forum](https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301). ### References A post-mortem will be published in a few days in the [OpenZeppelin Forum](https://forum.openzeppelin.com/). ### For more information If you have any questions or comments about this advisory, or need assistance executing the mitigation, email us at [email protected].
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | @openzeppelin/contracts-upgradeable (npm) | 4.1.0 to before 4.3.2 | 4.3.2 | Patch available | GHSA-q4h9-46xg-m3x9 |
- @openzeppelin/contracts-upgradeable (npm) Vendor— Affected 4.1.0 to before 4.3.2 Fixed in 4.3.2 Patch available GHSA-q4h9-46xg-m3x9
Remediation
- Fix · GHSA-q4h9-46xg-m3x9 @openzeppelin/contracts-upgradeable (npm) Fixed in 4.3.2 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-q4h9-46xg-m3x9
References
Sources
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