CVE-2026-114117 Vyper 0.3.8 through 0.5.0b1 Optimizer Miscompilation of msg.value | K in Ternary Branches
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-114117?
CVE-2026-114117 is a high-severity vulnerability in vyperlang vyper, published on 21 Oct 2026.
Official description
Vyper 0.3.8 through 0.5.0b1 contains an optimizer miscompilation in which (msg.value | K) or (len(msg.data) | K), where K is any nonzero integer literal, is compiled to the constant 1 when used as a ternary expression branch under -O gas (the default) or -O codesize. Affected contracts use the wrong value in storage writes, arithmetic, indexes, return values, or events without warning or revert, which can record deposits incorrectly and lock funds.
Weakness: CWE-682
Which versions are affected by CVE-2026-114117?
How do I fix CVE-2026-114117?
No fix has been published for CVE-2026-114117 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-114117 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-114117 exists.
Sources
Also known as GHSA-6j9c-gvcw-74fj, GHSA-xvvp-6q7c-mxwj.