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CVE-2026-23881

Estado: AnalizadaMedia (6.5)—

Kyverno is a policy engine designed for cloud native platform engineering teams. Versions prior to 1.16.3 and 1.15.3 have unbounded memory consumption in Kyverno's policy engine that allows users with policy creation privileges to cause denial of service by crafting policies that exponentially amplify string data through context variables. Versions 1.16.3 and 1.15.3 contain a patch for the vulnerability.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Kyverno — Kyverno

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23881",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23881",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-27T16:32:37.256106Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.7,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 3.1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
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        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
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      "source": "security-advisories@github.com",
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          "product": "kyverno",
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              "status": "affected",
              "version": "< 1.15.3"
            },
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              "status": "affected",
              "version": ">= 1.16.0, < 1.16.3"
            }
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  ],
  "published": "2026-01-27T17:16:12.733",
  "references": [
    {
      "url": "https://github.com/kyverno/kyverno/commit/7a651be3a8c78dcabfbf4178b8d89026bf3b850f",
      "tags": [
        "Patch"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/kyverno/kyverno/commit/f5617f60920568a301740485472bf704892175b7",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/kyverno/kyverno/security/advisories/GHSA-r2rj-wwm5-x6mq",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Kyverno is a policy engine designed for cloud native platform engineering teams. Versions prior to 1.16.3 and 1.15.3 have unbounded memory consumption in Kyverno's policy engine that allows users with policy creation privileges to cause denial of service by crafting policies that exponentially amplify string data through context variables. Versions 1.16.3 and 1.15.3 contain a patch for the vulnerability."
    },
    {
      "lang": "es",
      "value": "Kyverno es un motor de políticas diseñado para equipos de ingeniería de plataformas nativas de la nube. Las versiones anteriores a la 1.16.3 y 1.15.3 tienen un consumo de memoria ilimitado en el motor de políticas de Kyverno que permite a los usuarios con privilegios de creación de políticas causar una denegación de servicio mediante la elaboración de políticas que amplifican exponencialmente los datos de cadena a través de variables de contexto. Las versiones 1.16.3 y 1.15.3 contienen un parche para la vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T10:22:14.887",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EC83E83A-2BA5-4A52-AF06-06E67CA03749",
              "versionEndExcluding": "1.15.3"
            },
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              "criteria": "cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AFFC15A4-197B-44FB-985A-BDDE22679655",
              "versionEndExcluding": "1.16.3",
              "versionStartIncluding": "1.16.0"
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          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}