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signature-vulnerabilities

Identify and mitigate signature vulnerabilities in Solidity smart contracts.

120|12|Updated Apr 10, 2026
Search Tags:#security#verification#solidity#signature#eip-712#nonce-management
One-click install
npx skills add https://github.com/ccashwell/evm-cortex --skill signature-vulnerabilities
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: signature-vulnerabilities
Source: https://github.com/ccashwell/evm-cortex/tree/main/skills/signature-vulnerabilities
Command: npx skills add https://github.com/ccashwell/evm-cortex --skill signature-vulnerabilities

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Signature vulnerabilities in Solidity enable replay, malleability, and unsafe verification patterns that can compromise user funds and contract integrity.

Core Features & Use Cases

  • Secure verification patterns: guidance on EIP-712 domain separators, nonces, and safe signature recovery.
  • Attack vectors and mitigations: coverage of replay attacks, malleability, and permit front-running.
  • Practical examples: scenarios for permit, meta-transactions, and gasless approvals.

Quick Start

Ask me to audit a contract’s signature verification flow and implement safe patterns.

Frequently Asked Questions about signature-vulnerabilities

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
What are signature vulnerabilities in Solidity and how do they impact smart contracts?▼

Signature vulnerabilities in Solidity enable replay attacks, signature malleability, and unsafe verification patterns that compromise user funds and contract integrity during signature recovery.

How do I audit a smart contract's signature verification flow for replay attacks?▼

To audit signature verification, review the contract's EIP-712 domain separators, nonce management, and malleability controls to ensure safe signature recovery patterns are implemented correctly.

How does EIP-712 domain separator usage prevent signature exploits in Solidity?▼

EIP-712 domain separators prevent signature exploits by binding signature verification to a specific contract and chain, mitigating cross-chain replay attacks and ensuring safe domain usage.

What is the best way to implement nonce management for meta-transactions in Solidity?▼

The best way to implement nonce management for meta-transactions is combining unique nonces with EIP-712 domain separators to prevent replay attacks and ensure safe verification patterns.

Why does signature malleability occur in Solidity ecrecover and how can I mitigate it?▼

Signature malleability occurs because ecrecover accepts multiple valid signature formats, which you mitigate by enforcing strict malleability controls and safe verification patterns during signature recovery.

Can I use this to secure gasless approvals and permit front-running in Solidity contracts?▼

Yes, this applies to securing gasless approvals and permit front-running by providing mitigations for unsafe verification patterns through proper nonce handling and EIP-712 domain separators.

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