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

February 21, 2025 (updated February 24, 2025)

Vyper’s 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.

the fix is tracked in https://github.com/vyperlang/vyper/pull/4486

References

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

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