{"id":"CVE-2026-114114","revision":"0b69cf0655ed4c32957f5b67a0e4517f","records":[{"revision":"0b69cf0655ed4c32957f5b67a0e4517f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-114114","aliases":[],"title":"Vyper through 0.5.0b1 Literal Value Substitution via Multi-byte Characters","description":"Vyper 0.1.0b1 before 0.1.0b12, 0.1.0b14, and 0.4.1 through 0.5.0b1 mix character-based line offsets with Python's UTF-8 byte col_offset values in vyper/ast/parse.py, so multi-byte characters shift the source slices used to reconstruct later numeric literals. An attacker contributing source with non-ASCII identifiers that NFKC-normalize to ASCII, or an invisible byte-order mark, can silently substitute addresses, integers or other constants in compiled code.","state":0,"publishedAt":"2026-10-21T00:37:12.518+00:00","modifiedAt":"2026-10-21T00:37:12.518+00:00","affected":[{"ecosystem":"Vendor product","name":"vyper","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vyperlang\",\n                    \"product\": \"vyper\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/vyper\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0.1.0b1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"python\",\n                            \"lessThan\": \"0.1.0b12\"\n                        },\n                        {\n                            \"version\": \"0.1.0b12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"python\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"vyper","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vyperlang\",\n                    \"product\": \"vyper\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/vyper\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0.1.0b14\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"python\",\n                            \"lessThan\": \"0.1.0b15\"\n                        },\n                        {\n                            \"version\": \"0.1.0b15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"python\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"vyper","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vyperlang\",\n                    \"product\": \"vyper\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/vyper\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0.4.1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"python\",\n                            \"lessThanOrEqual\": \"0.5.0b1\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":6,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw","https://www.vulncheck.com/advisories/vyper-through-0.5-0b1-literal-value-substitution-via-multi-byte-characters"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114114","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-114114","identifiers":["CVE-2026-114114"]},"retained":false,"historicalAffected":[]}],"coverage":[]}