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Advisories

Kyverno before 1.19.2 Denial of Service via Exponential-Time Wildcard Matching

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Severity
high
Date
Affecting

  • kyverno >= 0, < 1.19.2

CWE
  • CWE-407 Inefficient Algorithmic Complexity
CVSS
8.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Credit
1diot9
Description
Kyverno before 1.19.2 contains a denial of service vulnerability that allows namespaced policy authors to exhaust admission controller CPU by submitting pathological wildcard patterns. Attackers can create a Policy with crafted match and exclude names evaluated by ValidateMatchExcludeConflict, pinning cores and causing cluster-wide webhook timeouts that block resource operations.

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