{"cve":"CVE-2023-30541","nvd":{"published":"2023-04-17T22:15:10.357","modified":"2026-06-17T05:54:58.910","status":"Modified","description":"OpenZeppelin Contracts is a library for secure smart contract development. 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 and could cause a reduction in availability. The issue has been fixed in version 4.8.3. As a workaround 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-436"],"references":["https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154","https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.8.3","https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-mx2q-35m2-x2rh","https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154","https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.8.3"],"products":["openzeppelin:contracts","openzeppelin:contracts_upgradeable"],"source":"nvd","synced_at":"2026-10-19T21:38:05.473481323+00:00"},"epss":{"cve":"CVE-2023-30541","score":0.00812,"percentile":0.56995,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mx2q-35m2-x2rh","url":"https://osv.dev/vulnerability/GHSA-mx2q-35m2-x2rh","summary":"OpenZeppelin Contracts TransparentUpgradeableProxy clashing selector calls may not be delegated","modified":"2026-09-10T03:50:01.099654307Z","packages":[{"ecosystem":"npm","name":"@openzeppelin/contracts","purl":"pkg:npm/%40openzeppelin/contracts","ranges":[">=3.2.0 <4.8.3"],"fixed":["4.8.3"]},{"ecosystem":"npm","name":"@openzeppelin/contracts-upgradeable","purl":"pkg:npm/%40openzeppelin/contracts-upgradeable","ranges":[">=3.2.0 <4.8.3"],"fixed":["4.8.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}