CVE-2021-48019
Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 21, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 20, 2026
Description
Vyper before 0.2.9 deploys forwarder proxies through the built-in create_forwarder_to function that report a fixed 4096-byte RETURNDATASIZE rather than the actual return data size. Calls through these proxies can yield corrupted data when a function returns more than 4096 bytes without return data sanitation, and fail strict return-size checks such as SafeERC20.safeTransfer.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L | VulnCheck |
Weaknesses
- CWE-805 Buffer Access with Incorrect Length Value
Affected Products
| Product | Versions |
|---|---|
vypervyperlang |
|
References
- GitHub Security Advisory (GHSA-375m-5fvv-xq23)vendor-advisory
- VulnCheck Advisory: Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxiesthird-party-advisory
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