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Public proof of conceptFix available

CVE-2022-29255

A public proof of concept exists; no exploitation attested.

  • Published2022-06-09
  • Fixed in0.3.4
  • WeaknessCWE-670

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions prior to 0.3.4 when a calling an external contract with no return value, the contract address (including side effects) could be evaluated twice. This may result in incorrect outcomes for contracts. This issue has been addressed in v0.3.4.

Timeline

dates in UTC
  1. 2022-06-0909:15CVE publishedNVD

Versions per branch

NVD · OSV
Vyperlang vyper
BranchAffectedFixed in
0.3< 0.3.40.3.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • vyperlang vyper
    Affected
    • = < 0.3.4no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-06-06

Fix

  1. Update Vyperlang vyper to 0.3.4

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-04-22
  • CNACVSS 3.18.2known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-670known since 2026-10-23
  • NVDweakness (CWE)CWE-670read 2026-10-23
  • FIRST EPSSEPSS score1.3 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2022-06-06

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2022-06-09
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4v9q-cgpw-cf38

Frequently asked questions

What is CVE-2022-29255?

Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions prior to 0.3.4 when a calling an external contract with no return value, the contract address (including side effects) could be evaluated twice. This may result in incorrect outcomes for contracts. This issue has been addressed in v0.3.4.

Is CVE-2022-29255 actively exploited?

A proof-of-concept exploit exists for CVE-2022-29255, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2022-29255?

CVE-2022-29255 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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Sources for this record