CVE-2025-26622: vyper — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-682 CWE-682

Affected Products

Vendor	Product	Versions
vyperlang	vyper	< 0.4.1

References

Advisories & Patches

https://github.com/vyperlang/vyper/pull/4486 https://github.com/vyperlang/vyper/security/advisories/GHSA-2p94-8669-xg86

Frequently Asked Questions

What is CVE-2025-26622? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-26622? +

CVE-2025-26622 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-26622? +

CVE-2025-26622 affects products from vyperlang, specifically: vyper. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-26622? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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