Mmastodon TechnologyCybersecurity first seen 4 d ago, last 4 d ago, peak #2

Vyper vulnerability EUVD-2021-34889 scores 6.3

Original: 🚨 EUVD-2021-34889 📊 Score: 6.3/10 (CVSS v3.1) 📦 Product: vyper 🏢 Vendor: vyperlang 📅 Updated: 2026-10-21 📝 Vyper before

A medium-severity vulnerability, EUVD-2021-34889, has been catalogued for Vyper, the Pythonic smart contract language maintained by vyperlang. Versions before 0.2.9 deploy forwarder proxies via the built-in create_forwarder_to function that report a fixed 4096-byte RETURNDATASIZE instead of the actual return data size, which can mislead calling contracts. The entry carries a CVSS v3.1 score of 6.3 out of 10 and was updated in the EUVD database.

Why now: Security trackers flagged the updated advisory, drawing attention from developers of Vyper-based smart contracts.

VypervyperlangEUVD

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Evidence

• 🚨 EUVD-2021-34889 📊 Score: 6.3/10 (CVSS v3.1) 📦 Product: vyper 🏢 Vendor: vyperlang 📅 Updated: 2026-10-21 📝 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… · EUVD_Bot

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