Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw
- https://www.vulncheck.com/advisories/vyper-through-0.5-0b1-literal-value-substit
- https://github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw
FAQ
What is CVE-2026-114114?
CVE-2026-114114 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2026-114114?
CVE-2026-114114 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-114114?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.