VULNERABILITY INTELLIGENCE

CVE-2018-18920

CVSS score8.8 HIGH
EPSS probability2.93%
CISA KEVNot currently listed
Published2018-11-12
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.execute_bytecode call that triggers computation._stack.values with '"stack": [100, 100, 0]' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed indefinitely without gas being paid."

Weakness classification

  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Primary references