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High

GovernorCompatibilityBravo may trim proposal calldata

  • Disclosed: 20.04.2023
  • Updated: 11.10.2026 10:22

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.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package @openzeppelin/contracts >= 4.3.0, < 4.8.3 4.8.3
npm package @openzeppelin/contracts-upgradeable >= 4.3.0, < 4.8.3 4.8.3

References

CVSS score 8.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-20
Platform
npm
Package
@openzeppelin/contracts, @openzeppelin/contracts-upgradeable
Disclosed
20.04.2023
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-93hq-5wgc-jc82 - CC BY 4.0

Vulnerability history: @openzeppelin/contracts-upgradeable

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (22) in the archive
Total entries
22
First → latest
08.2021 07.2025
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 3
  • High 5
  • Medium 12
  • Low 2

Disclosures per year

Severity:
  1. GovernorCompatibilityBravo may trim proposal calldata this entry
    High · 8.8 CVE-2023-30542 >= 4.3.0, < 4.8.3 4.8.3
  2. OpenZeppelin Contracts vulnerable to ECDSA signature malleability
    High · 7.9 CVE-2022-35961 >= 4.1.0, < 4.7.3 4.7.3
  3. OpenZeppelin Contracts's GovernorVotesQuorumFraction updates to quorum may affect past defeated proposals
    High · 7.5 CVE-2022-31198 >= 4.3.0, < 4.7.2 4.7.2
  4. OpenZeppelin Contracts's SignatureChecker may revert on invalid EIP-1271 signers
    High · 7.5 CVE-2022-31172 >= 4.1.0, < 4.7.1 4.7.1
  5. OpenZeppelin Contracts's ERC165Checker may revert instead of returning false
    High · 7.5 CVE-2022-31170 >= 4.0.0, < 4.7.1 4.7.1
  6. UUPSUpgradeable vulnerability in @openzeppelin/contracts
    Critical · 9.8 CVE-2021-41264 >= 4.1.0, < 4.3.2 4.3.2
  7. UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable
    Critical ghsa-q4h9-46xg-m3x9 >= 4.1.0, < 4.3.2 4.3.2
  8. TimelockController vulnerability in OpenZeppelin Contracts
    Critical · 10.0 CVE-2021-39168 >= 4.0.0, < 4.3.1, >= 3.3.0, < 3.4.2 4.3.1, 3.4.2

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