CVE-2026-114114

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

Product

Vyper

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-176CWE-176

How to fix

Update

vyperlang vyper0.1.0b12, 0.1.0b15 or later

Vendor advisories

github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw

Affected products

Product	Affected versions	Fixed in
vyperlang vyper	0.1.0b1 ≤ v < 0.1.0b12, 0.1.0b14 ≤ v < 0.1.0b15, 0.4.1 ≤ v ≤ 0.5.0b1	0.1.0b12, 0.1.0b15

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