Vulnerability in Vyperlang Vyper
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vyperlang/vyper/security/advisories/GHSA-r3c7-7xwm-6vfw (vendor-advisory)
- www.vulncheck.com/advisories/vyper-through-0.5-0b1-literal-value-substitution-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-114114?
- CVE-2026-114114 is a medium-severity vulnerability in Vyperlang Vyper, classified under CWE-176. CVSS score: 5.3/10. Published 2026-10-21.
- How severe is CVE-2026-114114?
- Medium severity. CVSS v3 base score is 5.3 out of 10.