{"id":"CVE-2022-24787","aliases":["EUVD-2022-0353","GHSA-7vrm-3jc8-5wwm","PYSEC-2022-196"],"status":"published","title":"Incorrect Comparison in Vyper","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.","severity":{"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":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01029,"percentile":0.63928,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-697"],"published":"2022-04-04T17:35:10Z","modified":"2026-10-28T02:31:02Z","fixes":[{"ecosystem":"PyPI","package":"vyper","fixed_in":["0.3.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"vyper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.2"}]}]},{"source":"osv","ecosystem":"PyPI","package":"vyper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.2"}]}],"versions":["0.1.0b1","0.1.0b10","0.1.0b11","0.1.0b12","0.1.0b13","0.1.0b14","0.1.0b15","0.1.0b16","0.1.0b17","0.1.0b2","0.1.0b3","0.1.0b4","0.1.0b5","0.1.0b6","0.1.0b7","0.1.0b8","0.1.0b9","0.2.1","0.2.10","0.2.11","0.2.12","0.2.13","0.2.14","0.2.15","0.2.16","0.2.2","0.2.3","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.3.0","0.3.1"]},{"source":"osv","ecosystem":"PyPI","package":"vyper","ranges":[{"type":"GIT","events":[{"introduced":"0"},{"fixed":"2c73f8352635c0a433423a5b94740de1a118e508"}]},{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.2"}]}],"versions":["0.1.0b1","0.1.0b10","0.1.0b11","0.1.0b12","0.1.0b13","0.1.0b14","0.1.0b15","0.1.0b16","0.1.0b17","0.1.0b2","0.1.0b3","0.1.0b4","0.1.0b5","0.1.0b6","0.1.0b7","0.1.0b8","0.1.0b9","0.2.1","0.2.10","0.2.11","0.2.12","0.2.13","0.2.14","0.2.15","0.2.16","0.2.2","0.2.3","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.3.0","0.3.1"]}],"products":[{"vendor":"vyperlang","product":"vyper"}],"references":[{"url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","advisory","web"]},{"url":"https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2022-196.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7vrm-3jc8-5wwm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/24xxx/CVE-2022-24787.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-24787","tags":["advisory"]},{"url":"https://github.com/vyperlang/vyper","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2022-24787","title":"Incorrect Comparison in Vyper","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.","status":"published","published":"2022-04-04T17:35:10Z","modified":"2025-04-23T18:41:56.894Z","cvss":[{"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":"cna"}],"cwes":["CWE-697"],"updated_at":"2026-11-02T14:34:34.940806Z"}],"euvd":[{"id":"EUVD-2022-0353","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.","status":"published","published":"2022-04-04T17:35:10Z","modified":"2025-04-23T18:41:56Z","cvss":[{"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"}],"updated_at":"2026-11-02T20:52:07.950001Z"}],"ghsa":[{"id":"GHSA-7vrm-3jc8-5wwm","title":"Incorrect Comparison in Vyper","description":"### Impact\nbytestrings can have dirty bytes in them, resulting in the word-for-word comparison to give incorrect results, e.g.\n```vyper\nb1: Bytes[32] = b\"abcdef\"\nb1 = slice(b1, 0, 1)\nb2: Bytes[32] = b\"abcdef\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\neven without dirty nonzero bytes, because there is no comparison of the length, two bytestrings can compare to equal if one ends with `\"\\x00\"`.\n```vyper\nb1: Bytes[32] = b\"abc\\0\"\nb2: Bytes[32] = b\"abc\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\n\n### Patches\nfixed in https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508","status":"published","published":"2022-04-04T21:40:45Z","modified":"2023-01-11T05:06:19Z","cvss":[{"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"}],"cwes":["CWE-697"],"updated_at":"2026-11-02T14:36:12.361159Z"}],"nvd":[{"id":"CVE-2022-24787","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.","status":"published","published":"2022-04-04T18:15:07.877Z","modified":"2026-06-17T04:32:31.1Z","cvss":[{"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":"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"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-697"],"updated_at":"2026-11-02T14:07:14.706146Z"}],"osv":[{"id":"CVE-2022-24787","title":"Incorrect Comparison in Vyper","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.","status":"published","published":"2022-04-04T17:35:10Z","modified":"2026-10-28T02:31:02.106264239Z","cvss":[{"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"}],"cwes":["CWE-697"],"updated_at":"2026-11-02T15:44:24.428403Z"},{"id":"GHSA-7vrm-3jc8-5wwm","title":"Incorrect Comparison in Vyper","description":"### Impact\nbytestrings can have dirty bytes in them, resulting in the word-for-word comparison to give incorrect results, e.g.\n```vyper\nb1: Bytes[32] = b\"abcdef\"\nb1 = slice(b1, 0, 1)\nb2: Bytes[32] = b\"abcdef\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\neven without dirty nonzero bytes, because there is no comparison of the length, two bytestrings can compare to equal if one ends with `\"\\x00\"`.\n```vyper\nb1: Bytes[32] = b\"abc\\0\"\nb2: Bytes[32] = b\"abc\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\n\n### Patches\nfixed in https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508","status":"published","published":"2022-04-04T21:40:45Z","modified":"2024-12-05T05:47:08.393067Z","cvss":[{"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"}],"cwes":["CWE-697"],"updated_at":"2026-11-02T15:46:41.349637Z"},{"id":"PYSEC-2022-196","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.","status":"published","published":"2022-04-04T18:15:00Z","modified":"2023-11-08T04:08:36.471326Z","updated_at":"2026-11-02T15:52:53.449407Z"}]}}