What’s Vulnerable › Vulnerabilities

CVE-2021-47952: python jsonpickle 2.0.0 Remote Code Execution via py/repr

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-16 · updated 2026-07-15
• Weakness: CWE-94

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 products

• Jsonpickle python jsonpickle: 2.0.0

References

• https://github.com/jsonpickle/jsonpickle
• https://jsonpickle.github.io
• https://www.exploit-db.com/exploits/49585
• https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr
• https://access.redhat.com/security/cve/CVE-2021-47952
• https://bugzilla.redhat.com/show_bug.cgi?id=2478170
• https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47952.json

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