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HIGH severity

OpenZeppelin Contracts's SignatureChecker may revert on invalid EIP-1271 signersGHSA-4g63-c64m-25w9

HIGHFix: OpenZeppelin/openzeppelin-contracts#3552

GHSA-4g63-c64m-25w9 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in @openzeppelin/contracts. A fix is available for @openzeppelin/contracts — see the affected versions and patch details below.

Also known asCVE-2022-31172
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-4g63-c64m-25w9.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs43th percentile — riskier than 43% of all scored CVEsHighest risk
0.00%0.33%0.67%1.00%0.1%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

4Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@openzeppelin/contractsnpm
1.4Mdownloads / week
@openzeppelin/contracts-upgradeablenpm
431Kdownloads / week

Description

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 [email protected].

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
📦npm@openzeppelin/contracts≥ 4.1.0&&< 4.7.14.7.1npm install @openzeppelin/contracts@4.7.1
📦npm@openzeppelin/contracts-upgradeable≥ 4.1.0&&< 4.7.14.7.1npm install @openzeppelin/contracts-upgradeable@4.7.1

Affected Products

1 product · 1 configurations
Application
contractsopenzeppelin
≥ 4.1.0 && < 4.7.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @openzeppelin/contracts, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @openzeppelin/contracts to 4.7.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4g63-c64m-25w9 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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
O3 Security · Impact-Aware SCA

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OpenZeppelin Contracts's SignatureChecker may revert…