CVE-2021-47952CWE-94

python jsonpickle 2.0.0 Remote Code Execution via py/repr

Critical · published May 16, 2026

CVSS v4.0
9.3
EPSS
1%
Percentile
52.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
Vector
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
EPSS
0.00696 · 52.5th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-05-16T15:26Z
EPSS history
Timeline
  • 16 MAY 15:26Z
    python jsonpickle 2.0.0 Remote Code Execution via py/repr
    cvelistv5