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CVE-2023-30542

GovernorCompatibilityBravo may trim proposal calldata

6.8 MediumFix available

OpenZeppelin Contracts is a library for secure smart contract development. The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata. This issue has been patched in 4.8.3. As a workaround, ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
High
Availability
Low

Exploit likelihood

0.58%Up 0.5 points since Apr 16, 2023
90%50%10%1%

What each source reports

CVE List Score used 6.8

GovernorCompatibilityBravo may trim proposal calldata

OpenZeppelin Contracts is a library for secure smart contract development. The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata. This issue has been patched in 4.8.3. As a workaround, ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Record
CVE-2023-30542
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2023-1247 6.8

OpenZeppelin Contracts is a library for secure smart contract development. The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata. This issue has been patched in 4.8.3. As a workaround, ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Record
EUVD-2023-1247
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L
Updated
2026-11-03
GitHub AdvisoriesGHSA-93hq-5wgc-jc82 8.8

GovernorCompatibilityBravo may trim proposal calldata

Impact

The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata.

Patches

This issue has been patched in v4.8.3.

Workarounds

Ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Record
GHSA-93hq-5wgc-jc82
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
NVD 6.8

OpenZeppelin Contracts is a library for secure smart contract development. The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata. This issue has been patched in 4.8.3. As a workaround, ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Record
CVE-2023-30542
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
OSV 6.8

GovernorCompatibilityBravo may trim proposal calldata

OpenZeppelin Contracts is a library for secure smart contract development. The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata. This issue has been patched in 4.8.3. As a workaround, ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Record
CVE-2023-30542
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L
Weakness
CWE-20
Updated
2026-11-02
OSVGHSA-93hq-5wgc-jc82 8.8

GovernorCompatibilityBravo may trim proposal calldata

Impact

The proposal creation entrypoint (propose) in GovernorCompatibilityBravo allows the creation of proposals with a signatures array shorter than the calldatas array. This causes the additional elements of the latter to be ignored, and if the proposal succeeds the corresponding actions would eventually execute without any calldata. The ProposalCreated event correctly represents what will eventually execute, but the proposal parameters as queried through getActions appear to respect the original intended calldata.

Patches

This issue has been patched in v4.8.3.

Workarounds

Ensure that all proposals that pass through governance have equal length signatures and calldatas parameters.

Record
GHSA-93hq-5wgc-jc82
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
@openzeppelin/contracts
npm
 4.3.0 up to 4.8.3
4.8.3
@openzeppelin/contracts-upgradeable
npm
 4.3.0 up to 4.8.3
4.8.3

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-2023-30542 is a medium vulnerability (CVSS 6.8) in Openzeppelin Contracts, published April 16, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.58%, the 48th percentile. Fixed in @openzeppelin/contracts 4.8.3.

References

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