{"id":"CVE-2024-32481","summary":"vyper's range(start, start + N) reverts for negative numbers","details":"Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Starting in version 0.3.8 and prior to version 0.4.0b1, when looping over a `range` of the form `range(start, start + N)`, if `start` is negative, the execution will always revert. This issue is caused by an incorrect assertion inserted by the code generation of the range `stmt.parse_For_range()`. The issue arises when `start` is signed, instead of using `sle`, `le` is used and `start` is interpreted as an unsigned integer for the comparison. If it is a negative number, its 255th bit is set to `1` and is hence interpreted as a very large unsigned integer making the assertion always fail. Any contract having a `range(start, start + N)` where `start` is a signed integer with the possibility for `start` to be negative is affected. If a call goes through the loop while supplying a negative `start` the execution will revert. Version 0.4.0b1 fixes the issue.","aliases":["GHSA-ppx5-q359-pvwj","PYSEC-2024-246"],"modified":"2026-04-02T10:49:14.405572Z","published":"2024-04-25T17:00:54.082Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/32xxx/CVE-2024-32481.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-681"]},"references":[{"type":"WEB","url":"https://github.com/vyperlang/vyper/blob/9136169468f317a53b4e7448389aa315f90b95ba/vyper/codegen/stmt.py#L286-L287"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/32xxx/CVE-2024-32481.json"},{"type":"ADVISORY","url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-ppx5-q359-pvwj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-32481"},{"type":"FIX","url":"https://github.com/vyperlang/vyper/commit/3de1415ee77a9244eb04bdb695e249d3ec9ed868"},{"type":"FIX","url":"https://github.com/vyperlang/vyper/commit/5319cfbe14951e007ccdb323257e5ada869b35d5"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/vyperlang/vyper","events":[{"introduced":"036f153683e0d55b890305eb4c77680a0872fcba"},{"fixed":"6fb750af3972160f871f62bb49a44827acf06423"}]}],"versions":["v0.3.10","v0.3.10rc1","v0.3.10rc2","v0.3.10rc3","v0.3.10rc4","v0.3.10rc5","v0.3.8","v0.3.9"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-32481.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}