mcp-server-semgrep/semgrep-rules/java/lang/security/use-snakeyaml-constructor.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: use-snakeyaml-constructor
  languages:
  - java
  metadata:
    owasp:
    - A08:2017 - Insecure Deserialization
    - A08:2021 - Software and Data Integrity Failures
    cwe:
    - 'CWE-502: Deserialization of Untrusted Data'
    references:
    - https://securitylab.github.com/research/swagger-yaml-parser-vulnerability/#snakeyaml-deserialization-vulnerability
    category: security
    technology:
    - snakeyaml
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: HIGH
    confidence: LOW
  message: >-
    Used SnakeYAML org.yaml.snakeyaml.Yaml() constructor with no arguments, which
    is vulnerable to deserialization attacks.
    Use the one-argument Yaml(...) constructor instead, with SafeConstructor or a
    custom Constructor as the argument.
  patterns:
  - pattern: |
      $Y = new org.yaml.snakeyaml.Yaml();
      ...
      $Y.load(...);
  severity: WARNING