CVE-2026-4035

{
  "id": "CVE-2026-4035",
  "sourceIdentifier": "security@huntr.dev",
  "published": "2026-06-03T09:16:13.083",
  "lastModified": "2026-06-03T14:16:45.847",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in mlflow/mlflow versions prior to 3.11.0 allows for the resolution of environment variables in AI Gateway secrets, which can be exploited to exfiltrate sensitive server-side environment credentials to an attacker-controlled endpoint. This issue arises because the `api_key` field in gateway secrets can accept `$ENV_VAR` references, which are resolved against the MLflow server's environment during runtime. The resolved secrets are then sent in provider authentication headers to the configured upstream `api_base`. This vulnerability can be exploited by low-privileged authenticated users in basic-auth deployments or by unauthenticated users in default deployments without `basic-auth`. The impact includes potential leakage of sensitive credentials such as cloud artifact credentials (`AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`), which could lead to artifact poisoning and cross-boundary code execution in downstream environments. The issue is fixed in version 3.11.0."
    }
  ],
  "metrics": {
    "cvssMetricV30": [
      {
        "source": "security@huntr.dev",
        "type": "Secondary",
        "cvssData": {
          "version": "3.0",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 5.3
      }
    ]
  },
  "weaknesses": [
    {
      "source": "security@huntr.dev",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-201"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/mlflow/mlflow/commit/4a3f2f720cb4f058c9e0c5b883e0acc9ab64a7f3",
      "source": "security@huntr.dev"
    },
    {
      "url": "https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233",
      "source": "security@huntr.dev"
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    {
      "url": "https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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}