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Advisories

Kyverno before 1.19.2 Denial of Service via Shallow Variable Substitution Panic

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Severity
high
Date
Affecting

  • kyverno >= 0, < 1.19.2

CWE
  • CWE-248 Uncaught Exception
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
r0binak
Description
Kyverno before 1.19.2 contains an unchecked type assertion in its variable-substitution engine that allows users who can submit resources to crash the policy engine. Attackers can submit resources with non-string fields referenced by {{- variable }} shallow substitution in policies, causing a panic that yields webhook denial of service and policy bypass under failurePolicy Ignore.

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