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High, CVSS 7.5amended

OpenZeppelin Contracts's SignatureChecker may revert on invalid EIP-1271 signers

CVE-2022-31172GHSA-4g63-c64m-25w9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@openzeppelin/contracts 4.7.1; @openzeppelin/contracts-upgradeable 4.7.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
  • CVE-2022-31172: 0.50% estimated exploitation activity in the next 30 days; percentile 43.06 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact SignatureChecker.isValidSignatureNow is not expected to revert. However, an incorrect assumption about Solidity 0.8's abi.decode allows some cases to revert, given a target contract that doesn't implement EIP-1271 as expected. The contracts that may be affected are those that use SignatureChecker to check the validity of a signature and handle invalid signatures in a way other than reverting. We believe this to be unlikely. Patches The issue was patched in 4.7.1. References https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3552 For more information If you have any questions or comments about this advisory, or need assistance deploying the fix, email us at security@openzeppelin.com.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-4g63-c64m-25w9

  2. Revision 1 · created ·

    Published from osv record GHSA-4g63-c64m-25w9

Agent brief

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# Patch Next advisory brief: CVE-2022-31172

Advisory: OpenZeppelin Contracts's SignatureChecker may revert on invalid EIP-1271 signers
IDs: CVE-2022-31172, GHSA-4g63-c64m-25w9
Record: https://patchnext.com/advisories/cve-2022-31172 (revision 2, source checked 26 Oct 2026, 12:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @openzeppelin/contracts 4.7.1; @openzeppelin/contracts-upgradeable 4.7.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @openzeppelin/contracts: affected >= 4.1.0, < 4.7.1; fixed in 4.7.1
- npm @openzeppelin/contracts-upgradeable: affected >= 4.1.0, < 4.7.1; fixed in 4.7.1

## Suggested inspection (read-only)
- `npm ls @openzeppelin/contracts --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @openzeppelin/contracts-upgradeable --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @openzeppelin/contracts, @openzeppelin/contracts-upgradeable.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-4g63-c64m-25w9 (OSV record GHSA-4g63-c64m-25w9 lists affected ranges: npm @openzeppelin/contracts >=4.1.0 =4.1.0 <4.7.1 (fixed))
- Verified: https://github.com/advisories/GHSA-4g63-c64m-25w9 (GitHub-reviewed advisory GHSA-4g63-c64m-25w9 lists affected ranges: npm @openzeppelin/contracts >=4.1.0 =4.1.0 <4.7.1)

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