modules:
  - module: std
    versions:
      - fixed: 1.15.13
      - introduced: 1.16.0
        fixed: 1.16.5
    packages:
      - package: math/big
        symbols:
          - Rat.SetString
description: |
    Rat.SetString and Rat.UnmarshalText may cause a panic or an
    unrecoverable fatal error if passed inputs with very large
    exponents.
published: 2022-02-17T17:33:07Z
cves:
  - CVE-2021-33198
credit: |
    the OSS-Fuzz project for discovering this issue and to Emmanuel
    Odeke for reporting it
references:
  - fix: https://go.dev/cl/316149
  - fix: https://go.googlesource.com/go/+/6c591f79b0b5327549bd4e94970f7a279efb4ab0
  - web: https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI
  - report: https://go.dev/issue/45910