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CVE-2024-32645

vyper performs incorrect topic logging in raw_log

5.3 MediumFix available

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. As of time of publication, no fixed version is available.

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

0.45%Up 0.4 points since Apr 26, 2024
90%50%10%1%

What each source reports

CVE List Score used 5.3

vyper performs incorrect topic logging in raw_log

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. As of time of publication, no fixed version is available.

Record
CVE-2024-32645
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-20
Updated
2026-11-02
EUVDEUVD-2024-0182 5.3

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. As of time of publication, no fixed version is available.

Record
EUVD-2024-0182
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-xchq-w5r3-4wg3 5.3

vyper performs incorrect topic logging in raw_log

Summary

Incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics.

A contract search was performed and no vulnerable contracts were found in production. In particular, no uses of raw_log() were found at all in production; it is apparently not a well-known function.

Details

The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics.

PoC

x: bytes32

@external
def f():
    self.x = 0x1234567890123456789012345678901234567890123456789012345678901234
    raw_log([self.x], b"") # LOG1(offset:0x60, size:0x00, topic1:0x00)

    y: bytes32 = 0x1234567890123456789012345678901234567890123456789012345678901234
    raw_log([y], b"") # LOG1(offset:0x80, size:0x00, topic1:0x40)

Patches

Fixed in https://github.com/vyperlang/vyper/pull/3977.

Impact

Incorrect values can be logged which may result in unexpected behavior in client-side applications relying on these logs.

Record
GHSA-xchq-w5r3-4wg3
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-20
Updated
2026-11-02
NVD 5.3

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. As of time of publication, no fixed version is available.

Record
CVE-2024-32645
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-20
Updated
2026-11-02
OSV 5.3

vyper performs incorrect topic logging in raw_log

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. As of time of publication, no fixed version is available.

Record
CVE-2024-32645
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-20
Updated
2026-11-02
OSVGHSA-xchq-w5r3-4wg3 5.3

vyper performs incorrect topic logging in raw_log

Summary

Incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics.

A contract search was performed and no vulnerable contracts were found in production. In particular, no uses of raw_log() were found at all in production; it is apparently not a well-known function.

Details

The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics.

PoC

x: bytes32

@external
def f():
    self.x = 0x1234567890123456789012345678901234567890123456789012345678901234
    raw_log([self.x], b"") # LOG1(offset:0x60, size:0x00, topic1:0x00)

    y: bytes32 = 0x1234567890123456789012345678901234567890123456789012345678901234
    raw_log([y], b"") # LOG1(offset:0x80, size:0x00, topic1:0x40)

Patches

Fixed in https://github.com/vyperlang/vyper/pull/3977.

Impact

Incorrect values can be logged which may result in unexpected behavior in client-side applications relying on these logs.

Record
GHSA-xchq-w5r3-4wg3
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-20
Updated
2026-11-02
OSVPYSEC-2024-206 5.3

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, incorrect values can be logged when raw_log builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. The build_IR function of the RawLog class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. As of time of publication, no fixed version is available.

Record
PYSEC-2024-206
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
 before 0.4.0
0.4.0
vyper
PyPI
 before 0.4.0, plus listed versions
0.1.0b10.1.0b100.1.0b110.1.0b120.1.0b13
Show 45 moreShow less
0.1.0b140.1.0b150.1.0b160.1.0b170.1.0b20.1.0b30.1.0b40.1.0b50.1.0b60.1.0b70.1.0b80.1.0b90.2.10.2.100.2.110.2.120.2.130.2.140.2.150.2.160.2.20.2.30.2.40.2.50.2.60.2.70.2.80.2.90.3.00.3.10.3.100.3.10rc10.3.10rc20.3.10rc30.3.10rc40.3.10rc50.3.20.3.30.3.40.3.50.3.60.3.70.3.80.3.90.4.0b1
0.4.0

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-2024-32645 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 0.45%, the 39th percentile. Fixed in vyper 0.4.0.

References

This page doesn't list everything

Left out here: 11 versions. The JSON record has them.

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