Vulnerability-Lookup

CVE-2021-47952 (GCVE-0-2021-47952)

Vulnerability from cvelistv5 – Published: 2026-05-16 15:26 – Updated: 2026-07-28 01:47

Title

python jsonpickle 2.0.0 Remote Code Execution via py/repr

Summary

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.

Severity

9.3 (Critical)


                        
                          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

9.8 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-18 17:00 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')
CWE-502 - Deserialization of Untrusted Data

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7435 records in the last 180 days details

References

7 references

URL	Tags
https://www.exploit-db.com/exploits/49585	exploit
https://jsonpickle.github.io	product
https://github.com/jsonpickle/jsonpickle	product
https://www.vulncheck.com/advisories/python-jsonp…	third-party-advisory
https://access.redhat.com/security/cve/CVE-2021-47952	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2478170	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

2 products

Vendor	Product	Version	CPE status
Jsonpickle	python jsonpickle	Affected: 2.0.0 cpe:2.3:a:jsonpickle_project:jsonpickle:2.0.0:::::::*
Red Hat	Red Hat Ansible Automation Platform 2	cpe:/a:redhat:ansible_automation_platform:2

Date Public

2021-02-24 00:00

Credits

Adi Malyanker, Shay Reuven

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2021-47952

Vulnerability from fkie_nvd - Published: 2026-05-16 16:16 - Updated: 2026-07-15 02:17

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/jsonpickle/jsonpickle
	disclosure@vulncheck.com	https://jsonpickle.github.io
	disclosure@vulncheck.com	https://www.exploit-db.com/exploits/49585
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2021-47952
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2478170
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47952.json

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
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          "vendor": "Jsonpickle",
          "versions": [
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          "cpes": [
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          "defaultStatus": "unaffected",
          "packageName": "ansible-automation-platform-24/lightspeed-rhel8",
          "product": "Red Hat Ansible Automation Platform 2",
          "vendor": "Red Hat"
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          "defaultStatus": "unaffected",
          "packageName": "ansible-automation-platform-25/lightspeed-rhel8",
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  "lastModified": "2026-07-15T02:17:05.733",
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GHSA-GV3J-FJGF-469V

Vulnerability from github – Published: 2026-05-16 18:31 – Updated: 2026-06-27 06:30

Details

Severity

9.8 (Critical)


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

9.3 (Critical)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-47952"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502",
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-16T16:16:21Z",
    "severity": "CRITICAL"
  },
  "details": "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 system commands and arbitrary code.",
  "id": "GHSA-gv3j-fjgf-469v",
  "modified": "2026-06-27T06:30:24Z",
  "published": "2026-05-16T18:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47952"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2021-47952"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2478170"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jsonpickle/jsonpickle"
    },
    {
      "type": "WEB",
      "url": "https://jsonpickle.github.io"
    },
    {
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47952.json"
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      "type": "WEB",
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    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

UBUNTU-CVE-2021-47952 (CVE-2021-47952)

Vulnerability from osv_ubuntu – Published: 2026-05-16 16:16 – Updated: 2026-10-17 09:10 – Source website

Details

Severity

9.8 (Critical)


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

9.8 (Critical)


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

9.3 (Critical)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-47952	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-47952	REPORT
	https://github.com/jsonpickle/jsonpickle	REPORT
	https://jsonpickle.github.io	REPORT
	https://www.exploit-db.com/exploits/49585	REPORT
	https://www.vulncheck.com/advisories/python-jsonp…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-jsonpickle",
            "binary_version": "0.9.2-1"
          },
          {
            "binary_name": "python3-jsonpickle",
            "binary_version": "0.9.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "jsonpickle",
        "purl": "pkg:deb/ubuntu/jsonpickle@0.9.2-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
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      ],
      "versions": [
        "0.8.0-1build1",
        "0.9.2-1"
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    },
    {
      "ecosystem_specific": {
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          {
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          },
          {
            "binary_name": "python3-jsonpickle",
            "binary_version": "0.9.5-1"
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
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        }
      ],
      "versions": [
        "1.2-1",
        "2.0.0+dfsg1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jsonpickle",
            "binary_version": "3.0.3+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "jsonpickle",
        "purl": "pkg:deb/ubuntu/jsonpickle@3.0.3+dfsg-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.0+dfsg1-1",
        "3.0.2+dfsg-1",
        "3.0.3+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jsonpickle",
            "binary_version": "4.0.2+dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "jsonpickle",
        "purl": "pkg:deb/ubuntu/jsonpickle@4.0.2+dfsg-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.2+dfsg-1",
        "4.0.2+dfsg-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jsonpickle",
            "binary_version": "4.0.2+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "jsonpickle",
        "purl": "pkg:deb/ubuntu/jsonpickle@4.0.2+dfsg-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.2+dfsg-2",
        "4.0.2+dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jsonpickle",
            "binary_version": "4.0.2+dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "jsonpickle",
        "purl": "pkg:deb/ubuntu/jsonpickle@4.0.2+dfsg-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.2+dfsg-2"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2021-47952",
  "modified": "2026-10-17T09:10:06Z",
  "published": "2026-05-16T16:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-47952"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-47952"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jsonpickle/jsonpickle"
    },
    {
      "type": "REPORT",
      "url": "https://jsonpickle.github.io"
    },
    {
      "type": "REPORT",
      "url": "https://www.exploit-db.com/exploits/49585"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-47952"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2021-47952 (GCVE-0-2021-47952)

FKIE_CVE-2021-47952

GHSA-GV3J-FJGF-469V

UBUNTU-CVE-2021-47952 (CVE-2021-47952)

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Vulnerability timeline

Related by attack behaviour