FKIE_CVE-2026-41185

Vulnerability from fkie_nvd - Published: 2026-05-28 17:16 - Updated: 2026-06-05 17:03
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
When Calico is configured with the Azure IPAM plugin, the Calico CNI binary mutates the incoming CNI configuration to attach subnet information before delegating to the IPAM plugin. After mutating, the Azure IPAM helper logs the entire unmarshaled configuration map (stdinData) at INFO level to /var/log/calico/cni/cni.log on every CNI ADD and DEL invocation — once per pod scheduled or terminated on the node. When the cluster is deployed using token-based Kubernetes authentication, this log entry contains the ServiceAccount token, client key, and certificate authority in plaintext. Any principal with read access to /var/log/calico/cni/cni.log on a node  can read these logs and extract the credentials, which grant cluster-wide Calico networking admin privileges.
References
psirt@tigera.iohttps://github.com/projectcalico/calico/pull/12502Issue Tracking
psirt@tigera.iohttps://github.com/projectcalico/calico/pull/12526Issue Tracking, Patch
psirt@tigera.iohttps://github.com/projectcalico/calico/pull/12527Issue Tracking, Patch
psirt@tigera.iohttps://www.tigera.io/security-bulletins/tta-2026-002/Vendor Advisory
Impacted products
Vendor Product Version
tigera calico *
tigera calico *
tigera calico *
tigera calico *
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{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:tigera:calico:*:*:*:*:enterprise:*:*:*",
              "matchCriteriaId": "68BC4A3E-A53E-463F-B627-EB21276BE079",
              "versionEndExcluding": "3.21.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:tigera:calico:*:*:*:*:open_source:*:*:*",
              "matchCriteriaId": "878E68F9-0DAD-465A-875C-AAEC94EB3C72",
              "versionEndExcluding": "3.32.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:tigera:calico:*:*:*:*:cloud:*:*:*",
              "matchCriteriaId": "91B89C3B-F20D-403E-9207-39C084B6BCDB",
              "versionEndExcluding": "22.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:tigera:calico:*:*:*:*:enterprise:*:*:*",
              "matchCriteriaId": "A3C3C22D-0E75-48A1-A1C7-8DD4FE15BF1E",
              "versionEndExcluding": "3.22.3",
              "versionStartIncluding": "3.22.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When Calico is configured with the Azure IPAM plugin, the Calico CNI binary mutates the incoming CNI configuration to attach subnet information before delegating to the IPAM plugin. After mutating, the Azure IPAM helper logs the entire unmarshaled configuration map (stdinData) at INFO level to /var/log/calico/cni/cni.log on every CNI ADD and DEL invocation \u2014 once per pod scheduled or terminated on the node. When the cluster is deployed using token-based Kubernetes authentication, this log entry contains the ServiceAccount token, client key, and certificate authority in plaintext. Any principal with read access to /var/log/calico/cni/cni.log on a node\u00a0 can read these logs and extract the credentials, which grant cluster-wide Calico networking admin privileges."
    }
  ],
  "id": "CVE-2026-41185",
  "lastModified": "2026-06-05T17:03:34.467",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.0,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "psirt@tigera.io",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-28T17:16:22.670",
  "references": [
    {
      "source": "psirt@tigera.io",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/projectcalico/calico/pull/12502"
    },
    {
      "source": "psirt@tigera.io",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/projectcalico/calico/pull/12526"
    },
    {
      "source": "psirt@tigera.io",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/projectcalico/calico/pull/12527"
    },
    {
      "source": "psirt@tigera.io",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.tigera.io/security-bulletins/tta-2026-002/"
    }
  ],
  "sourceIdentifier": "psirt@tigera.io",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-532"
        }
      ],
      "source": "psirt@tigera.io",
      "type": "Secondary"
    }
  ]
}


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