Remote Code Execution Vulnerability in Python jsonpickle by Jsonpickle Team
CVE-2021-47952

9.3CRITICAL

Key Information:

Vendor

Jsonpickle

Status
Python Jsonpickle
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47952?

The remote code execution vulnerability in version 2.0.0 of Python jsonpickle arises when the library deserializes malicious JSON payloads. Attackers can exploit this flaw by crafting JSON strings that contain py/repr directives, leading to the invocation of the eval function on the server. This allows for the execution of arbitrary Python commands, potentially compromising the integrity of the system running the affected version of jsonpickle.

Affected Version(s)

python jsonpickle 2.0.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47952 - Proof of Concept

References

https://www.exploit-db.com/exploits/49585
exploit
https://jsonpickle.github.io
product
https://github.com/jsonpickle/jsonpickle
product

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Adi Malyanker, Shay Reuven
.