CVE-2021-48019 — Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies
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 si…
Published: 2026-10-21 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7