Last updated: February 09, 2026

SCWE-026: Insufficient Hash Verification

Stable Version v1.0

This content is in the version-(v1.0) and still under active development, so it is subject to change any time (e.g. structure, IDs, content, URLs, etc.).

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Relationships

• CWE-347: Improper Verification of Cryptographic Signature
  CWE-347 Link

Description

Insufficient hash verification refers to the failure to properly verify hashes, such as message hashes or transaction hashes. This can lead to: - Unauthorized actions by malicious actors. - Loss of funds or data. - Exploitation of the contract's logic.

Remediation

• Validate hashes: Ensure all hashes are properly verified before processing.
• Use secure libraries: Leverage well-audited libraries for hash verification.
• Test thoroughly: Conduct extensive testing to ensure hash verification works as intended.

Examples

• Insufficient Hash Verification

  pragma solidity ^0.8.0;
  
  contract InsufficientHashVerification {
      function processHash(bytes32 hash) public {
          // Process hash without verification
      }
  }
  

• Sufficient Hash Verification

  pragma solidity ^0.8.0;
  
  contract SufficientHashVerification {
      function processHash(bytes32 hash, bytes memory data) public {
          require(keccak256(data) == hash, "Invalid hash");
          // Process hash
      }
  }
  

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