GitHub Advisoryadvisory · PyPI

GHSA-4hg4-9mf5-wxxq incorrect order of evaluation of side effects for some builtins

MEDIUM Published 2023-09-04 Modified 2026-09-17 Official page ↗
Aliases
CVE-2023-41052
Ecosystem
PyPI
Packages
vyper
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-670
Reviewed
2023-09-04

Affected packages

• PyPI vyper: < 0.3.10 → fixed in 0.3.10

Description

Impact The order of evaluation of the arguments of the builtin functions `uint256_addmod`, `uint256_mulmod`, `ecadd` and `ecmul` does not follow source order. • For `uint256_addmod(a,b,c)` and `uint256_mulmod(a,b,c)`, the order is `c,a,b`. • For `ecadd(a,b)` and `ecmul(a,b)`, the order is `b,a`. Note that this behaviour is problematic when the evaluation of one of the arguments produces side effects that other arguments depend on. Patches https://github.com/vyperlang/vyper/pull/3583 Workarounds When using builtins from the list above, make sure that the arguments of the expression do not produce side effects or, if one does, that no other argument is dependent on those side effects.

Related

Alias · CVE (1)

  • CVE-2023-41052 Vyper is a Pythonic Smart Contract Language. vulnerability

Weakness · CWE (1)

  • CWE-670 Always-Incorrect Control Flow Implementation weakness

References