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Security patterns · hard

47. Vyper security: known past vulnerability classes

Learning from real incidents in the Vyper ecosystem.

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Vyper is not immune to compiler bugs: certain older compiler versions had subtle issues (e.g. incorrect reentrancy-lock storage-slot collisions in specific versions in 2023 that led to real fund losses in some deployed pools). This is a reminder that language safety features reduce, but never eliminate, the need for careful auditing and using well-tested compiler versions.

# Pin and test against the exact compiler version you plan to deploy with
# @version 0.3.10

Track the official Vyper security advisories, avoid bleeding-edge compiler versions for production deployments, and re-audit if you must upgrade compiler versions on an already-designed contract.

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Check your understanding

  1. 1. Does using Vyper guarantee freedom from compiler-level bugs?

  2. 2. What practice reduces risk from compiler bugs?

  3. 3. What should you do if you must change compiler versions on a finished design?

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