Vulnerability · Published May 16, 2026 · Assigned by VulnCheck
CVE-2021-47952python jsonpickle 2.0.0 Remote Code Execution via py/repr
Critical 9.8
In plain English
A critical-severity code injection in python jsonpickle from Jsonpickle. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 46.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | jsonpickle | no fix listed | UBUNTU-CVE-2021-47952 |
| Ubuntu:24.04:LTS | jsonpickle | no fix listed | UBUNTU-CVE-2021-47952 |
| Ubuntu:25.10 | jsonpickle | no fix listed | UBUNTU-CVE-2021-47952 |
| Ubuntu:26.04:LTS | jsonpickle | no fix listed | UBUNTU-CVE-2021-47952 |
| Ubuntu:26.10 | jsonpickle | no fix listed | UBUNTU-CVE-2021-47952 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Jsonpickle | python jsonpickle | 2.0.0 |
Weakness: CWE-94, CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-49585 exploit
- Official Product Homepage product
- Product Reference product
- VulnCheck Advisory: python jsonpickle 2.0.0 Remote Code Execution via py/repr third-party-advisory
- https://access.redhat.com/security/cve/CVE-2021-47952 vdb-entry, x_refsource_REDHAT
- RHBZ#2478170 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47952.json x_sadp-csaf-vex