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

Quick assessment

Affected
vyperlang vyper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vyper是vyperlang开源的一个 EVM 的 Pythonic 智能合约语言。 Vyper存在安全漏洞，该漏洞源于sqrt函数处理不当，可能导致计算结果错误。

AI Predicted 5.3 Difficulty: Easy EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1574 · Hijack Execution Flow
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I. Basic Information for CVE-2025-26622

Vulnerability Information
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Vulnerability Title
sqrt doesn't define rounding behavior in Vyper
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Vyper 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vyper是vyperlang开源的一个 EVM 的 Pythonic 智能合约语言。 Vyper存在安全漏洞，该漏洞源于sqrt函数处理不当，可能导致计算结果错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper < 0.4.1 -

II. Public POCs for CVE-2025-26622

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III. Intelligence Information for CVE-2025-26622

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Patches & Fixes for CVE-2025-26622 (1)

Vendor Advisories for CVE-2025-26622 (1)

Same Patch Batch · vyperlang · 2025-02-21 · 3 CVEs total

CVE-2025-27105 AugAssign evaluation order causing OOB write within the object in Vyper
CVE-2025-27104 double eval in For List Iter in Vyper

IV. Related Vulnerabilities

Same product: vyper
Same vendor: vyperlang
Same weakness: CWE-682

V. Comments for CVE-2025-26622

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