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Vulnerabilities

Vulnerability · CVE-2025-47774

Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine.

Published May 15, 2025 · catalog updated May 15, 2025 · Vyper is the Pythonic

Check this week

CVE-2025-47774 is not in CISA KEV. FIRST estimates a 48.00% chance of exploitation in the next 30 days. Check whether you run Vyper is the Pythonic.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Vyper is the Pythonic).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
48.00%
Remediation
Advisory link
Affected products
vendor vyperlang vyper ≤ 0.4.2rc1

Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, the builtin can elide side effects when the output length is 0, and the source bytestring is a builtin ( or ). The reason is that for these source locations, the check that is skipped. The result is that a 0-length bytestring constructed with slice can be passed to , which elides evaluation of its source argument when the max length is 0. The impact is that side effects in the argument may be elided when the argument is 0, e.g. . The fix in pull request 4645 disallows any invo

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor vyperlang vyper ≤ 0.4.2rc1≤ 0.4.2rc1

How to fix CVE-2025-47774

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-47774 is not in CISA KEV. FIRST estimates a 48.00% chance of exploitation in the next 30 days. Check whether you run Vyper is the Pythonic.

Which versions are affected?

Compare what you have installed with vyperlang vyper ≤ 0.4.2rc1 ≤ 0.4.2rc1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 48.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 15, 2025 · EUVD

    Detected

    Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, the builtin can elide side effects when the output length is 0, and the source bytestring is a builtin ( or ). The reason is that for these source locations, the check that is skipped. The result is that a 0-length bytestring constructed with slice can be passed to , which elides

  2. May 15, 2025 · EUVD

    Updated

    Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, the builtin can elide side effects when the output length is 0, and the source bytestring is a builtin ( or ). The reason is that for these source locations, the check that is skipped. The result is that a 0-length bytestring constructed with slice can be passed to , which elides

Sources

  • CVE.orgVulnerability recordCVE-2025-47774

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-15443

    Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, the builtin can elide side effects when the output length is 0, and the source bytestring is a builtin ( or ). The reason is that for these source locations, the

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog May 15, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.