{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.3.4"
              },
              {
                "fixed": "1.3.7"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "81070c4266f2c7e0bb614f84585b3bd0cb721ce1"
            },
            {
              "fixed": "0dd18084589a3d3e577d1f1a8a48fb485c94a5e6"
            },
            {
              "fixed": "4720dfca2bde27fa140ec287a05709668fbdf168"
            },
            {
              "fixed": "81715a5a258ae2657369344f4e3523e5fbabb2af"
            }
          ],
          "repo": "https://github.com/hydra-ecosystem/hydra",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mwj6-rfh8-7qf4"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-470",
      "CWE-693"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106439.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.4.0.dev4"
          },
          {
            "fixed": "1.4.0.dev10"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Hydra is a framework for elegantly configuring complex applications. From 1.3.4 until 1.3.7 and 1.4.0.dev10, Hydra stores legacy instantiate target blocklists and related execution-policy collections in mutable module-level state. An attacker who controls multiple sibling target entries can resolve hydra._internal.target_policy.UNCONTROLLED_EXECUTION_TARGETS.discard through instantiate(), remove a denied target, and then invoke that target because sibling nodes are processed in insertion order against the same modified policy. The mutation persists in process-global state and can enable code execution with the application's privileges, while a narrow execution whitelist supplied by trusted Python code is not bypassed by the reported direct mutation path. This issue is fixed in versions 1.3.7 and 1.4.0.dev10.",
  "id": "CVE-2026-106439",
  "modified": "2026-10-08T02:30:59.141684622Z",
  "published": "2026-10-06T18:49:12.110Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106439.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-mwj6-rfh8-7qf4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106439"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/0dd18084589a3d3e577d1f1a8a48fb485c94a5e6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/4720dfca2bde27fa140ec287a05709668fbdf168"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hydra: Mutable instantiate policy sets allow target blocklist bypass"
}