Low severity · published Oct 21, 2026
CVE-2026-114115
Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection
3.7
CVSS
0.3%
EPSS
No
On KEV
Description
Vyper 0.3.8 through 0.5.0b1 contains a compiler miscompilation vulnerability in parse_IfExp that reads nested arrays with narrower inner bounds using the wider result type's memory layout. When a ternary selects the narrower array, inner arrays after the first are read at wrong offsets, causing contracts to silently store corrupted values or revert.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VY
vyper · vyperlang
0.3.8 through 0.5.0b1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114115
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114115
github.com
https://github.com/vyperlang/vyper/commit/1fb7dfe2
github.com
https://github.com/vyperlang/vyper/security/advisories/GHSA-cw3h-xwxq-8cx2
www.vulncheck.com
https://www.vulncheck.com/advisories/vyper-0.3.8-through-0.5-0b1-memory-misread-via-ternary-nested-array-selection
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