CVE-2026-114114

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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
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
https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw

Configurations

No configuration.

History

28 Oct 2026, 17:17

Type	Values Removed	Values Added
References	~~() https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw -~~	() https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw -

21 Oct 2026, 01:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-21 01:17

Updated : 2026-10-28 17:17

NVD link : CVE-2026-114114

Mitre link : CVE-2026-114114

CVE.ORG link : CVE-2026-114114

JSON object : View

Products Affected

No product.

CWE

CWE-176

Improper Handling of Unicode Encoding

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