modules:
  - module: gopkg.in/yaml.v2
    versions:
      - fixed: 2.2.3
    vulnerable_at: 2.2.2
    packages:
      - package: gopkg.in/yaml.v2
        symbols:
          - decoder.unmarshal
        derived_symbols:
          - Decoder.Decode
          - Unmarshal
          - UnmarshalStrict
  - module: github.com/go-yaml/yaml
    vulnerable_at: 2.1.0+incompatible
    packages:
      - package: github.com/go-yaml/yaml
        symbols:
          - decoder.unmarshal
        derived_symbols:
          - Decoder.Decode
          - Unmarshal
          - UnmarshalStrict
description: |
    Due to unbounded alias chasing, a maliciously crafted YAML file
    can cause the system to consume significant system resources. If
    parsing user input, this may be used as a denial of service vector.
published: 2021-04-14T20:04:52Z
credit: '@simonferquel'
references:
  - fix: https://github.com/go-yaml/yaml/pull/375
  - fix: https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
cve_metadata:
    id: CVE-2021-4235
    cwe: 'CWE 400: Uncontrolled Resource Consumption'