PT-2026-41450 · Pypi · Jsonpickle

CVE-2021-47952 · Published 2026-05-16 · Updated 2026-06-27

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions jsonpickle version 2.0.0

Description An issue exists where attackers can execute arbitrary Python commands by deserializing malicious JSON payloads containing py/repr objects. This occurs because crafted JSON strings with py/repr directives can invoke the eval() function during the deserialization process, potentially leading to full system compromise.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Code Injection

Deserialization of Untrusted Data

Weakness Enumeration

CWE-94

CWE-502

Related Identifiers

CVE-2021-47952

Affected Products

Jsonpickle

References · 15

• 🔥 https://exploit-db.com/exploits/49585 · Exploit
• https://ubuntu.com/security/CVE-2021-47952 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47952 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47952 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47952 · Vendor Advisory
• https://github.com/jsonpickle/jsonpickle · Note
• https://jsonpickle.github.io · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2478170 · Note
• https://twitter.com/UpwindMDR/status/2055853238247620695 · Twitter Post
• https://vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr · Note
• https://twitter.com/CVEnew/status/2055866582044205125 · Twitter Post
• https://t.me/cveNotify/177907 · Telegram Post
• https://access.redhat.com/security/cve/CVE-2021-47952 · Note
• https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47952.json · Note
• https://t.me/CVEtracker/54004 · Telegram Post