CVE-2026-114114
Published:October 21, 2026
Updated:October 21, 2026
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.
Affected Packages
https://github.com/vyperlang/vyper.git (GITHUB):
Affected version(s) =v0.1.0-beta.14 <v0.1.0-beta.15Fix Suggestion:
Update to version v0.1.0-beta.15https://github.com/vyperlang/vyper.git (GITHUB):
Affected version(s) >=v0.1.0-beta.1 <v0.1.0-beta.12Fix Suggestion:
Update to version v0.1.0-beta.12vyper (PYTHON):
Affected version(s) =0.1.0b14 <0.1.0b15Fix Suggestion:
Update to version 0.1.0b15vyper (PYTHON):
Affected version(s) >=0.1.0b1 <0.1.0b12Fix Suggestion:
Update to version 0.1.0b12Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Handling of Unicode Encoding