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Advisories

Vyper 0.1.0b10 before 0.2.3 Invalid Jump Destination via Return in Nested Loops

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Severity
medium
Date
Affecting

  • vyper >= 0.1.0b10, < 0.2.3

CWE
  • CWE-670 Always-Incorrect Control Flow Implementation
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
iamdefinitelyahuman
Description
Vyper from 0.1.0b10 before 0.2.3 generates incorrect code for a return statement inside a for loop in an internal function called two or more internal calls deep, producing an invalid jump destination (stack underflow). Affected contracts revert such calls unnecessarily, which in limited circumstances could enable denial of service against public contracts.

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