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No exploitation reportedFix available

CVE-2018-18920

No exploitation reported by the sources we read.

  • Published2018-11-12
  • Fixed in0.2.0a33
  • WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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."

Timeline

dates in UTC
  1. 2018-11-1202:29CVE publishedNVD

Versions per branch

OSV · NVD
py-evm
BranchAffectedFixed in
0.2< 0.2.0a330.2.0a33
0.2≤ 0.2.0a33no fix published
Ethereum py-evm
BranchAffectedFixed in
0.2= 0.2.0no fix published
evm-py
BranchAffectedFixed in
0.2≤ 0.2.0-alpha\.33no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update py-evm to 0.2.0a33

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2018-11-12
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-vqgp-4jgj-5j64

Frequently asked questions

What is CVE-2018-18920?

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."

Is CVE-2018-18920 actively exploited?

Active exploitation of CVE-2018-18920 has not been confirmed. Its EPSS score was 2.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-18920?

CVE-2018-18920 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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