Vulnerabilities CVE-2021-47952

CVE-2021-47952

Critical

Open

TLP:CLEAR

python jsonpickle 2.0.0 Remote Code Execution via py/repr

NVD CVE.org

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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.

Details

CVSS Score: 9.3
EPSS Score ⓘ: 0.70%

49.8th percentile
CVSS Vector: 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
Confidence: 90%
Published: May 16, 2026
Last Modified: Jul 28, 2026

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