module: std
package: math/big
versions:
  - fixed: go1.15.13
  - fixed: go1.16.5
  - fixed: go1.17.0
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
symbols:
  - Rat.SetString
links:
    pr: https://go.dev/cl/316149
    commit: https://go.googlesource.com/go/+/6c591f79b0b5327549bd4e94970f7a279efb4ab0
    context:
      - https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI
      - https://go.dev/issue/45910