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CVE-2024-32648

vyper default functions don't respect nonreentrancy keys

5.3 MediumFix available

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.41%Up 0.4 points since Apr 26, 2024
90%50%10%1%

What each source reports

CVE List Score used 5.3

vyper default functions don't respect nonreentrancy keys

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Record
CVE-2024-32648
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-667
Updated
2026-11-02
EUVDEUVD-2024-0179 5.3

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Record
EUVD-2024-0179
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-m2v9-w374-5hj9 5.3

vyper default functions don't respect nonreentrancy keys

Summary

Prior to v0.3.0, __default__() functions did not respect the @nonreentrancy decorator and the lock was not emitted. This is a known bug and was already visible in the issue tracker (https://github.com/vyperlang/vyper/issues/2455), but it is being re-issued as an advisory so that tools relying on the advisory publication list can incorporate it into their searches.

A contract search was additionally performed and no vulnerable contracts were found in production.

PoC

@external
@payable
@nonreentrant("default")
def __default__():
    pass

after codegen:

[seq,
  [if, [lt, calldatasize, 4], [goto, fallback]],
  [mstore, 28, [calldataload, 0]],
  [with, _func_sig, [mload, 0], seq],
  [seq_unchecked,
    [label, fallback],
    [seq,
      pass,
      # Line 5
      pass,
      pass,
      # Line 4
      stop]]],

Impact

No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low.

Record
GHSA-m2v9-w374-5hj9
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-667
Updated
2026-11-02
NVD 5.3

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Record
CVE-2024-32648
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-667
Updated
2026-11-02
OSV 5.3

vyper default functions don't respect nonreentrancy keys

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Record
CVE-2024-32648
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-667
Updated
2026-11-02
OSVGHSA-m2v9-w374-5hj9 5.3

vyper default functions don't respect nonreentrancy keys

Summary

Prior to v0.3.0, __default__() functions did not respect the @nonreentrancy decorator and the lock was not emitted. This is a known bug and was already visible in the issue tracker (https://github.com/vyperlang/vyper/issues/2455), but it is being re-issued as an advisory so that tools relying on the advisory publication list can incorporate it into their searches.

A contract search was additionally performed and no vulnerable contracts were found in production.

PoC

@external
@payable
@nonreentrant("default")
def __default__():
    pass

after codegen:

[seq,
  [if, [lt, calldatasize, 4], [goto, fallback]],
  [mstore, 28, [calldataload, 0]],
  [with, _func_sig, [mload, 0], seq],
  [seq_unchecked,
    [label, fallback],
    [seq,
      pass,
      # Line 5
      pass,
      pass,
      # Line 4
      stop]]],

Impact

No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low.

Record
GHSA-m2v9-w374-5hj9
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-667
Updated
2026-11-02
OSVPYSEC-2024-163 5.3

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Prior to version 0.3.0, default functions don't respect nonreentrancy keys and the lock isn't emitted. No vulnerable production contracts were found. Additionally, using a lock on a default function is a very sparsely used pattern. As such, the impact is low. Version 0.3.0 contains a patch for the issue.

Record
PYSEC-2024-163
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
vyper
PyPI
 through 0.2.16
0.3.0
vyper
PyPI
 before 0.3.0, plus listed versions
0.1.0b10.1.0b100.1.0b110.1.0b120.1.0b13
Show 28 moreShow less
0.1.0b140.1.0b150.1.0b160.1.0b170.1.0b20.1.0b30.1.0b40.1.0b50.1.0b60.1.0b70.1.0b80.1.0b90.2.10.2.100.2.110.2.120.2.130.2.140.2.150.2.160.2.20.2.30.2.40.2.50.2.60.2.70.2.80.2.9
0.3.0
vyper
PyPI
 before 0.3.0, plus listed versions
0.1.0b10.1.0b100.1.0b110.1.0b120.1.0b13
Show 45 moreShow less
0.1.0b140.1.0b150.1.0b160.1.0b170.1.0b20.1.0b30.1.0b40.1.0b50.1.0b60.1.0b70.1.0b80.1.0b90.2.10.2.100.2.110.2.120.2.130.2.140.2.150.2.160.2.20.2.30.2.40.2.50.2.60.2.70.2.80.2.9v0.2.16v0.2.15v0.2.14v0.2.13v0.2.12v0.2.11v0.2.10v0.2.9v0.2.8v0.2.7v0.2.6v0.2.5v0.2.4v0.2.3v0.2.2v0.2.1v0.2.0
0.3.0

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-32648 is a medium vulnerability (CVSS 5.3) in Vyperlang Vyper, published April 25, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 36th percentile. Fixed in vyper 0.3.0.

References

This page doesn't list everything

Left out here: 17 versions. The JSON record has them.

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