CVE-2021-48019Published

Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies

Exact source revision recorded 27 Oct 2026 22:45:55 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2021-48019

Published

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 published: 21 Oct 2026 00:36:18 UTC
Source modified: 27 Oct 2026 21:35:59 UTC
Observed here: 27 Oct 2026 22:45:55 UTC
Source terms: CVE Program Terms of Use

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 6.3 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

CVSS 3.1 · 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L