Panic on inputs with large exponents in math/big

ALTO 7.5CVE-2021-33198 · BIT-golang-2021-33198 · GO-2021-0242 · Published 02/08/2021 · updated 17/06/2026

En resumen

CVE-2021-33198 es una vulnerabilidad ALTO (CVSS 7.5) que afecta a stdlib, go (golang).
Probabilidad de explotación en los próximos 30 días (EPSS): 3.4%, mayor que el 88.8% de las vulnerabilidades.
Solución: actualizar a 1.16.5, 1.15.13 o posterior.

Package	Affected versions	Patched versions
stdlib Go	`≥ 1.16.0-0, < 1.16.5< 1.15.13`	`1.16.51.15.13`
go golang	`≥ 1.16.0, < 1.16.5< 1.15.13`	`1.16.51.15.13`

Rat.SetString and Rat.UnmarshalText may cause a panic or an unrecoverable fatal error if passed inputs with very large exponents.

NVD description

In Go before 1.15.13 and 1.16.x before 1.16.5, there can be a panic for a large exponent to the math/big.Rat SetString or UnmarshalText method.

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Package

Affected versions

Patched versions

≥ 1.16.0-0, < 1.16.5< 1.15.13

1.16.51.15.13

≥ 1.16.0, < 1.16.5< 1.15.13

1.16.51.15.13

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