CVE-2025-26622: vyper is a Pythonic Smart Contract Language for the EVM

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2025-26622 is a high-severity flaw (CVSS 7.5) affecting vyper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 t

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-682
Published	2025-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: vyperlang

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-02-21 22:15 UTCPublished CVE record published
2026-06-17 09:02 UTCUpdated Record last modified

vyperlang vyper UPGRADE

Affected: < 0.4.1

Fixed in: 0.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show vyper

2. UPGRADE to 0.4.1

pip install --upgrade "vyper>=0.4.1"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-26622?

vyper: upgrade to 0.4.1. Exact commands for each OS are on this page.

Is CVE-2025-26622 being exploited?

CVE-2025-26622 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-26622 affect?

CVE-2025-26622 affects vyper. Severity is high (CVSS 7.5). 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

How urgent is CVE-2025-26622?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-27105 CRITICAL 9.1 UPGRADE vyper is a Pythonic Smart Contract Language for the EVM
CVE-2025-27104 HIGH 7.5 UPGRADE vyper is a Pythonic Smart Contract Language for the EVM
CVE-2025-21607 HIGH 7.5 UPGRADE Vyper is a Pythonic Smart Contract Language for the EVM

References

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