CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HCVE-2023-31146
Critical (9.1) in vyperlang vyper. EPSS 1.3% chance of exploitation in the next 30 days. Fixed in vyper 0.3.8.
Vyper is a Pythonic smart contract language for the Ethereum virtual machine. Prior to version 0.3.8, during codegen, the length word of a dynarray is written before the data, which can result in out-of-bounds array access in the case where the dynarray is on both the lhs and rhs of an assignment. The issue can cause data corruption across call frames. The expected behavior is to revert due to out-of-bounds array access. Version 0.3.8 contains a patch for this issue.
Severity
- EPSS
- 1.3% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
- CWE
- CWE-787
- Published
- Modified
- Record from
- the NVD, synced
Affected
- vyperlang:vyper
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3p37-3636-q8wv | PyPI | vyper | <0.3.8 | 0.3.8 |
| PYSEC-2023-77 | PyPI | vyper | <0.3.8 | 0.3.8 |
References
- https://github.com/vyperlang/vyper/commit/4f8289a81206f767df1900ac48f485d90fc87edb
- https://github.com/vyperlang/vyper/security/advisories/GHSA-3p37-3636-q8wv
- https://github.com/vyperlang/vyper/commit/4f8289a81206f767df1900ac48f485d90fc87edb
- https://github.com/vyperlang/vyper/security/advisories/GHSA-3p37-3636-q8wv