What is CVE-2021-47952?

CVE-2021-47952 is a critical-severity vulnerability in Jsonpickle Python, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-16.

How severe is CVE-2021-47952?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Jsonpickle Python

CVE-2021-47952

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…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.004 (61.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Jsonpickle Python — versions 2.0.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47952?: CVE-2021-47952 is a critical-severity vulnerability in Jsonpickle Python, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-16.
How severe is CVE-2021-47952?: Critical severity. CVSS v3 base score is 9.8 out of 10.