CVE-2024-32646

vyper performs double eval of the slice args when buffer from adhoc locations

Published Apr 25, 2024 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `slice` builtin can result in a double eval vulnerability when the buffer argument is either `msg.data`, `self.code` or `<address>.code` and either the `start` or `length` arguments have side-effects. It can be easily triggered only with the versions `<0.3.4` as `0.3.4` introduced the unique symbol fence. No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low. As of time of publication, no fixed versions are available.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-0183 Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `slice` builtin can result in a double eval vulnerability when the buffer argument is either `msg.data`, `self.code` or `<address>.code` and either the `start` or `length` arguments have side-effects. It can be easily triggered only with the versions `<0.3.4` as `0.3.4` introduced the unique symbol fence. No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low. As of time of publication, no fixed versions are available.\n\n
Github GHSA Github GHSA GHSA-r56x-j438-vw5m vyper performs double eval of the slice start/length args in certain cases
History
Type Values Removed Values Added
Weaknesses NVD-CWE-Other
CPEs cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:*
Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 2, 2024, 2:13 AM
Reserved
Apr 16, 2024, 2:15 PM
Status
Analyzed
Published
Apr 25, 2024, 6:15 PM
Modified
Jun 17, 2026, 7:30 AM