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Vulnerability record · CVE-2021-47952 · published 16 May 2026

CVE-2021-47952: Code injection vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.70% · top 48.9% CWE-94 · Code injectionCWE-502 · Deserialization of untrusted data Deferred
9.3CVSS 4.0 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
15 Jul 2026Last modified by NVD

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: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:

References

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

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Source: NIST National Vulnerability Database (record CVE-2021-47952), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.