CVE-2026-114117 (GCVE-0-2026-114117)
Vulnerability from cvelistv5 – Published: 2026-10-21 00:37 – Updated: 2026-10-21 20:12
VLAI
EPSS
VEX
Title
Vyper 0.3.8 through 0.5.0b1 Optimizer Miscompilation of msg.value | K in Ternary Branches
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-21 20:11 UTC
CWE
- CWE-682 - Incorrect Calculation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/vyperlang/vyper/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/vyper-0.3.8-… | third-party-advisory |
Impacted products
Date Public
2026-10-02 00:00
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