Integer Overflow or Wraparound Affecting vyper package, versions [,0.3.8)


Severity

Recommended
0.0
high
0
10

CVSS assessment by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.19% (41st percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about Integer Overflow or Wraparound vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-PYTHON-VYPER-5529833
  • published12 May 2023
  • disclosed12 May 2023
  • credittrocher

Introduced: 12 May 2023

CVE-2023-32058  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade vyper to version 0.3.8 or higher.

Overview

vyper is a Pythonic Smart Contract Language for the EVM.

Affected versions of this package are vulnerable to Integer Overflow or Wraparound due to a missing check on the upper bound in loops of the form for i in range(a, a + N). (In loops like for i in range(start, stop) and for i in range(stop), the compiler is able to raise a TypeMismatch when trying to overflow the variable.)

PoC

@external
def test() -> uint16:
    x:uint8 = 255
    a:uint8 = 0
    for i in range(x, x+2):
        a = i
    return convert(a,uint16)  # returns 256

References

CVSS Base Scores

version 3.1