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Vulnerability record · CVE-2020-22083 · published 17 December 2020

CVE-2020-22083: Jsonpickle project jsonpickle deserialization of untrusted data vulnerability

JJsonpickle Project · Jsonpickle

jsonpickle through 1.4.1 allows remote code execution during deserialization of a malicious payload through the decode() function. Note: It has been argued that this is expected and clearly documented behaviour. pickle is known to be capable of causing arbitrary code execution, and must not be used with un-trusted data

9.8 CVSS 3.1 Critical EPSS 6.4% · top 6.5% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.1 base score, v2 7.5
6.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

jsonpickle through 1.4.1 allows remote code execution during deserialization of a malicious payload through the decode() function. Note: It has been argued that this is expected and clearly documented behaviour. pickle is known to be capable of causing arbitrary code execution, and must not be used with un-trusted data

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2020-22083 Third Party Advisory
https://gist.github.com/j0lt-github/bb543e77a1a10c33cb56cf23d0837874 Third Party Advisory
https://github.com/j0lt-github/python-deserialization-attack-payload-generator Third Party Advisory
https://github.com/jsonpickle/jsonpickle/issues/332 Third Party Advisory
https://github.com/jsonpickle/jsonpickle/issues/332#issuecomment-747807494 Third Party Advisory
https://versprite.com/blog/application-security/into-the-jar-jsonpickle-exploitation/ ExploitThird Party Advisory
https://access.redhat.com/security/cve/CVE-2020-22083 Third Party Advisory
https://gist.github.com/j0lt-github/bb543e77a1a10c33cb56cf23d0837874 Third Party Advisory
https://github.com/j0lt-github/python-deserialization-attack-payload-generator Third Party Advisory
https://github.com/jsonpickle/jsonpickle/issues/332 Third Party Advisory
https://github.com/jsonpickle/jsonpickle/issues/332#issuecomment-747807494 Third Party Advisory
https://versprite.com/blog/application-security/into-the-jar-jsonpickle-exploitation/ ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-22083), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.