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Advisories

Vyper 0.3.8 through 0.5.0b1 Memory Misread via Ternary Nested Array Selection

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Severity
medium
Date
Affecting

  • vyper >= 0.3.8, <= 0.5.0b1

CWE
  • CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
harkal
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.

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