CVSS 3.0
8.8 highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVE-2018-18920
High (8.8) in ethereum py-evm. EPSS 2.9% chance of exploitation in the next 30 days. Fixed in py-evm 0.2.0a33.
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."
Severity
- EPSS
- 2.9% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
- CWE
- CWE-119
- Published
- Modified
- Record from
- the NVD, synced
Affected
- ethereum:py-evm
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-vqgp-4jgj-5j64 | PyPI | py-evm | <=0.2.0a33 | no fix published |
| PYSEC-2018-155 | PyPI | evm-py | <=0.2.0-alpha\.33 | no fix published |
| PYSEC-2018-96 | PyPI | py-evm | <0.2.0a33 | 0.2.0a33 |
References
- https://github.com/ethereum/py-evm/issues/1448
- https://twitter.com/AlexanderFisher/status/1060923428641878019
- https://twitter.com/NettaLab/status/1060889400102383617
- https://www.reddit.com/r/ethereum/comments/9vkk2g/netta_labs_claim_to_have_found_a_vulnerability_in/e9d3wyx/
- https://github.com/ethereum/py-evm/issues/1448