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TI-2023-22606 Aliases CVE-2023-42441GHSA-3hg2-r75x-g69m

Vyper has incorrect re-entrancy lock when key is empty string

Priority LOW 31CWE-833Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Starting in version 0.2.9 and prior to version 0.3.10, locks of the type `@nonreentrant("")` or `@nonreentrant('')` do not produce reentrancy checks at runtime. This issue is fixed in version 0.3.10. As a workaround, ensure the lock name is a non-empty string.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00514 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vyper (vyperlang): 0.3.10vyper (PyPI): 0.3.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
vyperlangvyper0.2.9 to before 0.3.100.3.10Patch availableCNA
—vyper (PyPI)0.2.9 to before 0.3.100.3.10Patch availableGHSA-3hg2-r75x-g69m
  • vyper Vendorvyperlang Affected 0.2.9 to before 0.3.10 Fixed in 0.3.10 Patch available CNA
  • vyper (PyPI) Vendor— Affected 0.2.9 to before 0.3.10 Fixed in 0.3.10 Patch available GHSA-3hg2-r75x-g69m

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:*0.2.9 to before 0.3.10Vulnerablevyperlang
  • cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:* Versions 0.2.9 to before 0.3.10 Vulnerable ·vyperlang

Remediation

  • Fix · CNA vyper (vyperlang) Fixed in 0.3.10
  • Fix · GHSA-3hg2-r75x-g69m vyper (PyPI) Fixed in 0.3.10 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-42441
  2. 2026-10-03 Alias added: GHSA-3hg2-r75x-g69m

References

Exploit 1

Patch 2

Advisory 1

Other 2

  • TI-2024-16182 Vyper bounds check on built-in `slice()` function can be overflowed CVSS 3.1CRITICAL 9.8
  • TI-2024-14992 concat built-in can corrupt memory in vyper CVSS 3.1CRITICAL 9.8
  • TI-2024-16184 Vyper array negative index vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-08657 Integer bounds error in Vyper CVSS 3.1CRITICAL 9.8
  • TI-2022-11796 Multiple evaluation of contract address in call in vyper CVSS 3.1HIGH 8.2
  • TI-2024-21531 vyper performs double eval of the argument of sqrt CVSS 3.1MEDIUM 5.3
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences