Bug 2347042 (CVE-2025-26622)

Summary: CVE-2025-26622 vyper: sqrt doesn't define rounding behavior in Vyper
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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A flaw was found in Vyper’s sqrt() builtin function. This vulnerability allows incorrect rounding of square root calculations via improper handling of oscillating final states in the Babylonian method.
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Bug Depends On: 2347303, 2347304    
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Description OSIDB Bzimport 2025-02-21 22:01:22 UTC
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.