Home/CVE/Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflo
CVE

CVE-2023-30837

Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflo

Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the owner variable.

This issue was fixed in version 0.3.8.

HIGH · CVSS 7.5 EPSS 0.00249
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  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-789Memory Allocation with Excessive Size Value
▤

Affected Products & Versions

1
vyperlang vyper< 0.3.8
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI vyper HIGH fixed in 0.3.8
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-mgv8-gggw-mrg6github.com
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 May 2023 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bbPatch
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