FKIE_CVE-2026-25518

Vulnerability from fkie_nvd - Published: 2026-02-04 22:15 - Updated: 2026-02-05 14:57
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. In versions from 1.18.0 to before 1.18.5 and from 1.19.0 to before 1.19.3, the cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS. An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager's DNS cache. Accessing this entry will trigger a panic, resulting in denial‑of‑service (DoS) of the cert-manager controller. The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor. This issue has been patched in versions 1.18.5 and 1.19.3.
References
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/pull/8467
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/pull/8468
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/pull/8469
security-advisories@github.comhttps://github.com/cert-manager/cert-manager/security/advisories/GHSA-gx3x-vq4p-mhhv
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. In versions from 1.18.0 to before 1.18.5 and from 1.19.0 to before 1.19.3, the cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS. An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager\u0027s DNS cache. Accessing this entry will trigger a panic, resulting in denial\u2011of\u2011service (DoS) of the cert-manager controller. The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor. This issue has been patched in versions 1.18.5 and 1.19.3."
    },
    {
      "lang": "es",
      "value": "cert-manager a\u00f1ade certificados y emisores de certificados como tipos de recursos en cl\u00fasteres de Kubernetes, y simplifica el proceso de obtenci\u00f3n, renovaci\u00f3n y uso de esos certificados. En las versiones desde la 1.18.0 hasta antes de la 1.18.5 y desde la 1.19.0 hasta antes de la 1.19.3, el cert-manager-controller realiza b\u00fasquedas DNS durante el procesamiento ACME DNS-01 (para el descubrimiento de zonas y las autocomprobaciones de propagaci\u00f3n). Por defecto, estas b\u00fasquedas utilizan DNS est\u00e1ndar sin cifrar. Un atacante que puede interceptar y modificar el tr\u00e1fico DNS desde el pod del cert-manager-controller puede insertar una entrada manipulada en la cach\u00e9 DNS de cert-manager. Acceder a esta entrada provocar\u00e1 un p\u00e1nico, lo que resultar\u00e1 en una denegaci\u00f3n de servicio (DoS) del controlador de cert-manager. El problema tambi\u00e9n puede ser explotado si el servidor DNS autoritativo para el dominio que se est\u00e1 validando es controlado por un actor malicioso. Este problema ha sido parcheado en las versiones 1.18.5 y 1.19.3."
    }
  ],
  "id": "CVE-2026-25518",
  "lastModified": "2026-02-05T14:57:20.563",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-04T22:15:58.990",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/pull/8467"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/pull/8468"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/pull/8469"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cert-manager/cert-manager/security/advisories/GHSA-gx3x-vq4p-mhhv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-129"
        },
        {
          "lang": "en",
          "value": "CWE-704"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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