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CVE-2026-114114

CVE-2026-114114 · Vyper through 0.5.0b1 Literal Value Substitution via Multi-byte Characters

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.0 · Medium · EPSS 0.2% · Fix available

Published
Updated

Affected products and versions

  • vyper

    Versions
    • ≥ 0.1.0b1, < 0.1.0b12: Affected (python)
    • 0.1.0b12: Not affected (python)

    Update to 0.1.0b12

  • vyper

    Versions
    • ≥ 0.1.0b14, < 0.1.0b15: Affected (python)
    • 0.1.0b15: Not affected (python)

    Update to 0.1.0b15

  • vyper

    Versions
    • ≥ 0.4.1, ≤ 0.5.0b1: Affected (python)

    No fix published

Original sources

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