CVE-2026-114114 Vyper through 0.5.0b1 Literal Value Substitution via Multi-byte Characters
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-114114?
CVE-2026-114114 is a medium-severity vulnerability in vyperlang vyper, published on 21 Oct 2026.
Official 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.
Weakness: CWE-176
Which versions are affected by CVE-2026-114114?
How do I fix CVE-2026-114114?
No fix has been published for CVE-2026-114114 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-114114 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-114114 exists.
Sources
Also known as GHSA-r3c7-7xwm-6vfw, GHSA-vchg-h45q-h36m.