CVE-2021-47952

CRITICAL EPSS 48.4%

Published May 16, 20261mo ago · Modified Jun 27, 20263d ago

9.3 CVSS 4.0

Critical

Published May 16, 2026 1mo ago

Last Modified Jun 27, 2026 3d ago

Description

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 arbitrary code.

CVSS Details

Base Score

9.3

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

48.4% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 2

CWE-502 Deserialization of Untrusted Data Validation

CWE-94 Improper Control of Generation of Code (Code Injection) Injection

References 7

access.redhat.com https://access.redhat.com/security/cve/CVE-2021-47952
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2478170
github.com https://github.com/jsonpickle/jsonpickle
jsonpickle.github.io https://jsonpickle.github.io
security.access.redhat.com https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47952.json
exploit-db.com https://www.exploit-db.com/exploits/49585
vulncheck.com https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.