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        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-10-20T21:48:58.503Z",
        "datePublished": "2026-10-21T00:37:12.518Z",
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            "datePublic": "2026-10-06T00:00:00.000Z",
            "title": "Vyper through 0.5.0b1 Literal Value Substitution via Multi-byte Characters",
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                    "value": "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."
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                    "descriptions": [
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                            "lang": "en",
                            "description": "Improper Handling of Unicode Encoding",
                            "cweId": "CWE-176",
                            "type": "CWE"
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                    "product": "vyper",
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                        "Recovery": "NOT_DEFINED",
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                        "exploitMaturity": "NOT_DEFINED",
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                    "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "name": "GitHub Security Advisory (GHSA-r3c7-7xwm-6vfw)"
                },
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                    "name": "VulnCheck Advisory: Vyper through 0.5.0b1 Literal Value Substitution via Multi-byte Characters",
                    "tags": [
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                    "lang": "en",
                    "value": "hyeon-Sec",
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