id: GO-2021-0242
modules:
    - module: std
      versions:
        - fixed: 1.15.13
        - introduced: 1.16.0-0
          fixed: 1.16.5
      vulnerable_at: 1.16.4
      packages:
        - package: math/big
          symbols:
            - Rat.SetString
          skip_fix: 'TODO: revisit this reason (fix appears to not work with Go <1.18)'
summary: Panic on inputs with large exponents in math/big
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
credits:
    - The OSS-Fuzz project (discovery)
    - Emmanuel Odeke (reporter)
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