CVE-2020-37289Vyper before 0.3.1 Improper Input Validation of uint8 Interface Return Values
Updated under an hour ago ()
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It affects vyperlang vyper. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Vyper before 0.3.1 lacks a uint8 type, allowing interface return values declared as uint8, such as ERC20.decimals(), to be stored in uint256 variables without bounds checking. Malicious contracts can return values greater than 255 to manipulate or bypass contract logic that relies on these values.
- CVSS
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Received
- Record last updated
- Oct 21, 2026
- First seen by InfoSec Signals
- Oct 21, 2026
Affected products
vyperlang vyper vyperlang:vyper (from the name) | before 0.3.1; 0.3.1 not affected | CNA record |
References
- https://github.com/vyperlang/vyper/security/advisories/GHSA-mr6r-mvw4-736gvendor-advisory
- https://www.vulncheck.com/advisories/vyper-before-0.3.1-improper-input-validation-of-uint8-interface-return-valuesthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.