CVE-2023-42460: Vyper's `_abi_decode` input not validated in complex expressions

CVE-2023-42460 · Severity: low · CVSS 3.1 · Published 2023-09-27

Vyper is a Pythonic Smart Contract Language for the EVM. The `_abi_decode()` function does not validate input when it is nested in an expression. Uses of `_abi_decode()` can be constructed which allow for bounds checking to be bypassed resulting in incorrect results. This issue has not yet been fixed, but a fix is expected in release `0.3.10`. Users are advised to reference pull request #3626.

Technologies: vyper (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2023-42460 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2023-42460 being exploited in the wild.
How severe is CVE-2023-42460?
Low severity, with a CVSS score of 3.1, published 27 September 2023.
Which products and versions are affected?
vyper (PyPI) ECOSYSTEM:introduced=0.3.4,fixed=0.3.10.
Is there a fix for CVE-2023-42460?
Yes. vyper (PyPI): upgrade to 0.3.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2023-42460?
Check whether you run vyper (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • vyper (PyPI): upgrade to 0.3.10 or later
    pip install "vyper>=0.3.10"

Affected products

  • vyper (PyPI) ECOSYSTEM:introduced=0.3.4,fixed=0.3.10

Identifiers

  • CVE-2023-42460
  • GHSA-cx2q-hfxr-rj97
  • PYSEC-2023-191

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