Answer in brief
CVE-2023-30541 records a Medium severity (CVSS 5.3) vulnerability in OpenZeppelin Contracts TransparentUpgradeableProxy clashing selector calls may not be delegated. The current sources do not mark it as known exploited. The current feed maps @openzeppelin/contracts (npm), @openzeppelin/contracts-upgradeable (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @openzeppelin/contracts (npm), @openzeppelin/contracts-upgradeable (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @openzeppelin/contractsnpm | >=3.2.0 <4.8.3 | 4.8.3 |
| @openzeppelin/contracts-upgradeablenpm | >=3.2.0 <4.8.3 | 4.8.3 |
Published upstream
Apr 17, 2023
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
### Impact A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata. The probability of an accidental clash is negligible, but one could be caused deliberately. ### Patches The issue has been fixed in v4.8.3. ### Workarounds If a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through. ### References https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154
Quoted source text, attributed separately from HOL analysis.