CVE-2022-24845: Integer bounds error in Vyper

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-04-13 · updated 2026-06-17
Weakness: CWE-190

Description

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. In affected versions, the return of `<iface>.returns_int128()` is not validated to fall within the bounds of `int128`. This issue can result in a misinterpretation of the integer value and lead to incorrect behavior. As of v0.3.0, `<iface>.returns_int128()` is validated in simple expressions, but not complex expressions. Users are advised to upgrade. There is no known workaround for this issue.

Affected products

vyperlang vyper: before 0.3.2 — fixed in 0.3.2

How to fix

Upgrade to a fixed version: vyperlang vyper 0.3.2. Check the vendor advisory for mitigations.

References

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