CVE-2021-47952

CRITICAL 9.8

python jsonpickle 2.0.0 Remote Code Execution via py/repr

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

python jsonpickle 2.0.0 contains a remote code execution vulnerability that allows attackers to execute arbitrary Python commands by deserializing malicious JSON payloads containing py/repr objects. Attackers can craft JSON strings with py/repr directives that invoke the eval function during deserialization to execute system commands and arbitrary code.

CWE	CWE-94
Vendor	jsonpickle
Product	python jsonpickle
Published	May 16, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Jsonpickle / python jsonpickle

2.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/49585 jsonpickle.github.io: https://jsonpickle.github.io github.com: https://github.com/jsonpickle/jsonpickle vulncheck.com: https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr

Credits

Adi Malyanker, Shay Reuven