CVE-2021-47952 python jsonpickle 2.0.0 Remote Code Execution via py/repr
Attackers can execute arbitrary Python code by sending malicious JSON payloads to applications using the jsonpickle library for deserialization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47952?
CVE-2021-47952 is a critical unsafe deserialization vulnerability in python jsonpickle, published on 16 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2021-47952?
How do I fix CVE-2021-47952?
No fix has been published for CVE-2021-47952 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2021-47952 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47952 exists.
Sources
Also known as GHSA-gv3j-fjgf-469v, UBUNTU-CVE-2021-47952.