CVE-2025-26622: sqrt doesn't define rounding behavior in Vyper

2.3 CVSS

Description

vyper is a Pythonic Smart Contract Language for the EVM. Vyper `sqrt()` builtin uses the babylonian method to calculate square roots of decimals. Unfortunately, improper handling of the oscillating final states may lead to sqrt incorrectly returning rounded up results. This issue is being addressed and a fix is expected in version 0.4.1. Users are advised to upgrade as soon as the patched release is available. There are no known workarounds for this vulnerability.

Classification

CVE ID: CVE-2025-26622

CVSS Base Severity: LOW

CVSS Base Score: 2.3

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Problem Types

CWE-682: Incorrect Calculation

Affected Products

Vendor: vyperlang

Product: vyper

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 5.41% (scored less or equal to compared to others)

EPSS Date: 2025-03-22 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-26622
https://github.com/vyperlang/vyper/security/advisories/GHSA-2p94-8669-xg86
https://github.com/vyperlang/vyper/pull/4486

Timeline