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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.

PUBLISHED Reserved 2026-02-01 | Published 2026-05-16 | Updated 2026-06-27 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Control of Generation of Code ('Code Injection')

Product status

2.0.0
affected

Credits

Adi Malyanker, Shay Reuven finder

References

access.redhat.com/security/cve/CVE-2021-47952 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2478170 (RHBZ#2478170) issue-tracking

security.access.redhat.com/...2/vex/2021/cve-2021-47952.json

www.exploit-db.com/exploits/49585 (ExploitDB-49585) exploit

jsonpickle.github.io (Official Product Homepage) product

github.com/jsonpickle/jsonpickle (Product Reference) product

www.vulncheck.com/...ickle-remote-code-execution-via-py-repr (VulnCheck Advisory: python jsonpickle 2.0.0 Remote Code Execution via py/repr) third-party-advisory

cve.org (CVE-2021-47952)

nvd.nist.gov (CVE-2021-47952)

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