{"id":"CVE-2021-48018","aliases":["EUVD-2021-34888","GHSA-57w3-rr8j-wp9c","GHSA-7f92-rr6w-cq64"],"status":"published","title":"Vyper 0.2.13 before 0.2.15 Storage Corruption via @nonreentrant Decorator","description":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.","severity":{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00391,"percentile":0.33597,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-08-05T16:57:42Z","modified":"2026-10-25T02:45:06Z","fixes":[{"ecosystem":"PyPI","package":"vyper","fixed_in":["0.2.15"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"vyper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.13"},{"fixed":"0.2.15"}]}]},{"source":"osv","ecosystem":"PyPI","package":"vyper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.13"},{"fixed":"0.2.15"}]}],"versions":["0.2.13","0.2.14"]}],"products":[{"vendor":"vyperlang","product":"vyper"}],"references":[{"url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-7f92-rr6w-cq64","tags":["vendor-advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/vyper-0.2.13-before-0.2.15-storage-corruption-via-nonreentrant-decorator","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-48018"},{"url":"https://github.com/advisories/GHSA-57w3-rr8j-wp9c"},{"url":"https://github.com/vyperlang/vyper/pull/2379","tags":["web"]},{"url":"https://github.com/vyperlang/vyper/pull/2391","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7f92-rr6w-cq64"}],"sources":{"cve":[{"id":"CVE-2021-48018","title":"Vyper 0.2.13 before 0.2.15 Storage Corruption via @nonreentrant Decorator","description":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.","status":"published","published":"2026-10-21T00:36:18.265Z","modified":"2026-10-23T14:57:15.214Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-34888","description":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.","status":"published","published":"2026-10-21T00:36:18Z","modified":"2026-10-23T14:57:15Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:59:32.693959Z"}],"ghsa":[{"id":"GHSA-57w3-rr8j-wp9c","title":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the...","description":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.","status":"published","published":"2026-10-21T03:32:11Z","modified":"2026-10-21T03:32:16Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:14:08.480034Z"},{"id":"GHSA-7f92-rr6w-cq64","title":"Storage corruption due to variables overwritten by re-entrancy locks","description":"### Background\nWhen attempting to use the v0.2.14 release, @pandadefi discovered an issue using the `@nonreentrant` decorator.\n\n### Impact\nReentrancy protection storage slots get allocated to the same slots as storage variables, leading to the corruption of storage variables when using the `@nonreentrant` decorator.\n\n### Patches\nThis issue was fixed in v0.2.15 in #2391, #2379\n\n### Workarounds\nDon't use the `@nonreentrant` decorator in these versions.","status":"published","published":"2021-08-05T16:57:42Z","modified":"2023-01-09T05:04:46Z","updated_at":"2026-11-02T14:36:10.502376Z"}],"nvd":[{"id":"CVE-2021-48018","description":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.","status":"published","published":"2026-10-21T01:17:18.983Z","modified":"2026-10-23T15:17:20.357Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:09.005706Z"}],"osv":[{"id":"CVE-2021-48018","description":"Vyper from 0.2.13 before 0.2.15 allocates storage slots for @nonreentrant reentrancy locks at the same locations as contract storage variables. When a function using @nonreentrant is called, setting the lock overwrites the overlapping storage variable, corrupting contract state and breaking the contract's intended logic.","status":"published","published":"2026-10-21T01:17:18.983Z","modified":"2026-10-25T02:45:06.075575157Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:44:22.824781Z"},{"id":"GHSA-7f92-rr6w-cq64","title":"Storage corruption due to variables overwritten by re-entrancy locks","description":"### Background\nWhen attempting to use the v0.2.14 release, @pandadefi discovered an issue using the `@nonreentrant` decorator.\n\n### Impact\nReentrancy protection storage slots get allocated to the same slots as storage variables, leading to the corruption of storage variables when using the `@nonreentrant` decorator.\n\n### Patches\nThis issue was fixed in v0.2.15 in #2391, #2379\n\n### Workarounds\nDon't use the `@nonreentrant` decorator in these versions.","status":"published","published":"2021-08-05T16:57:42Z","modified":"2026-10-24T02:56:11.846071959Z","updated_at":"2026-11-02T15:46:41.002603Z"}]}}