{"id":"CVE-2023-49798","aliases":["EUVD-2023-3124","GHSA-699g-q6qh-q4v8"],"status":"published","title":"Duplicated execution of subcalls in OpenZeppelin Contracts","description":"OpenZeppelin Contracts is a library for smart contract development. A merge issue when porting the 5.0.1 patch to the 4.9 branch caused a line duplication. In the version of `Multicall.sol` released in `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4`, all subcalls are executed twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers. The duplicated delegatecall was removed in version 4.9.5. The 4.9.4 version is marked as deprecated. Users are advised to upgrade. There are no known workarounds for this issue.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00543,"percentile":0.45903,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-670"],"published":"2023-12-08T23:35:24Z","modified":"2026-10-28T02:31:04Z","fixes":[{"ecosystem":"npm","package":"@openzeppelin/contracts","fixed_in":["4.9.5"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"@openzeppelin/contracts-upgradeable","fixed_in":["4.9.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@openzeppelin/contracts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.9.4"},{"last_affected":"4.9.4"},{"fixed":"4.9.5"}]}],"versions":["4.9.4"]},{"source":"ghsa","ecosystem":"npm","package":"@openzeppelin/contracts-upgradeable","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.9.4"},{"last_affected":"4.9.4"},{"fixed":"4.9.5"}]}],"versions":["4.9.4"]},{"source":"osv","ecosystem":"npm","package":"@openzeppelin/contracts","ranges":[{"type":"SEMVER","events":[{"introduced":"4.9.4"},{"fixed":"4.9.5"}]}],"versions":["4.9.4"]},{"source":"osv","ecosystem":"npm","package":"@openzeppelin/contracts-upgradeable","ranges":[{"type":"SEMVER","events":[{"introduced":"4.9.4"},{"fixed":"4.9.5"}]}],"versions":["4.9.4"]}],"products":[{"vendor":"openzeppelin","product":"contracts"},{"vendor":"openzeppelin","product":"contracts_upgradeable"},{"vendor":"openzeppelin","product":"openzeppelin-contracts"}],"references":[{"url":"https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-699g-q6qh-q4v8","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://github.com/OpenZeppelin/openzeppelin-contracts/commit/88ac712e06832bce73b41e8166cded2729e25205","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-49798","tags":["advisory"]},{"url":"https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/31f9fb9d171f60b2271b2b9c6f62d43302bf9489","tags":["web"]},{"url":"https://github.com/advisories/GHSA-699g-q6qh-q4v8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49798.json","tags":["advisory"]},{"url":"https://github.com/OpenZeppelin/openzeppelin-contracts","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-49798","title":"Duplicated execution of subcalls in OpenZeppelin Contracts","description":"OpenZeppelin Contracts is a library for smart contract development. A merge issue when porting the 5.0.1 patch to the 4.9 branch caused a line duplication. In the version of `Multicall.sol` released in `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4`, all subcalls are executed twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers. The duplicated delegatecall was removed in version 4.9.5. The 4.9.4 version is marked as deprecated. Users are advised to upgrade. There are no known workarounds for this issue.","status":"published","published":"2023-12-08T23:35:24.467Z","modified":"2024-08-02T22:01:26.056Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-670"],"updated_at":"2026-11-02T14:35:13.368958Z"}],"euvd":[{"id":"EUVD-2023-3124","description":"OpenZeppelin Contracts is a library for smart contract development. A merge issue when porting the 5.0.1 patch to the 4.9 branch caused a line duplication. In the version of `Multicall.sol` released in `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4`, all subcalls are executed twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers. The duplicated delegatecall was removed in version 4.9.5. The 4.9.4 version is marked as deprecated. Users are advised to upgrade. There are no known workarounds for this issue.","status":"published","published":"2023-12-08T23:35:24Z","modified":"2024-08-02T22:01:26Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:49:55.731961Z"}],"ghsa":[{"id":"GHSA-699g-q6qh-q4v8","title":"OpenZeppelin Contracts and Contracts Upgradeable duplicated execution of subcalls in v4.9.4","description":"\n### Context\nMerge conflict resolution issue when porting the v5.0.1 `Multicall` update to the v4.9 branch caused a duplicated line.\n\n### Impact\nVersions using `Multicall` from `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4` will execute each subcall twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers.\n\n### Patches\nThe duplicated `delegatecall` was removed in 4.9.5. The 4.9.4 version is marked as deprecated.","status":"published","published":"2023-12-12T00:49:25Z","modified":"2023-12-12T00:49:26Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-670"],"updated_at":"2026-11-02T14:37:25.311671Z"}],"nvd":[{"id":"CVE-2023-49798","description":"OpenZeppelin Contracts is a library for smart contract development. A merge issue when porting the 5.0.1 patch to the 4.9 branch caused a line duplication. In the version of `Multicall.sol` released in `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4`, all subcalls are executed twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers. The duplicated delegatecall was removed in version 4.9.5. The 4.9.4 version is marked as deprecated. Users are advised to upgrade. There are no known workarounds for this issue.","status":"published","published":"2023-12-09T00:15:06.92Z","modified":"2026-06-17T06:36:29.25Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-670"],"updated_at":"2026-11-02T14:08:54.010507Z"}],"osv":[{"id":"CVE-2023-49798","title":"Duplicated execution of subcalls in OpenZeppelin Contracts","description":"OpenZeppelin Contracts is a library for smart contract development. A merge issue when porting the 5.0.1 patch to the 4.9 branch caused a line duplication. In the version of `Multicall.sol` released in `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4`, all subcalls are executed twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers. The duplicated delegatecall was removed in version 4.9.5. The 4.9.4 version is marked as deprecated. Users are advised to upgrade. There are no known workarounds for this issue.","status":"published","published":"2023-12-08T23:35:24.467Z","modified":"2026-10-28T02:31:04.374533125Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-670"],"updated_at":"2026-11-02T15:44:34.72355Z"},{"id":"GHSA-699g-q6qh-q4v8","title":"OpenZeppelin Contracts and Contracts Upgradeable duplicated execution of subcalls in v4.9.4","description":"\n### Context\nMerge conflict resolution issue when porting the v5.0.1 `Multicall` update to the v4.9 branch caused a duplicated line.\n\n### Impact\nVersions using `Multicall` from `@openzeppelin/contracts@4.9.4` and `@openzeppelin/contracts-upgradeable@4.9.4` will execute each subcall twice. Concretely, this exposes a user to unintentionally duplicate operations like asset transfers.\n\n### Patches\nThe duplicated `delegatecall` was removed in 4.9.5. The 4.9.4 version is marked as deprecated.","status":"published","published":"2023-12-12T00:49:25Z","modified":"2026-09-10T03:49:59.502012624Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-670"],"updated_at":"2026-11-02T15:46:39.618611Z"}]}}