CVE-2026-27952 Agenta has Python Sandbox Escape, Leading to Remote Code Execution (RCE)
Authenticated users can escape the Python sandbox via numpy introspection to execute arbitrary code on the Agenta API server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27952?
CVE-2026-27952 is a high-severity code injection vulnerability in Agenta-AI agenta-api, published on 26 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Agenta is an open-source LLMOps platform. In Agenta-API prior to version 0.48.1, a Python sandbox escape vulnerability existed in Agenta's custom code evaluator. Agenta used RestrictedPython as a sandboxing mechanism for user-supplied evaluator code, but incorrectly whitelisted the `numpy` package as safe within the sandbox. This allowed authenticated users to bypass the sandbox and achieve arbitrary code execution on the API server. The escape path was through `numpy.ma.core.inspect`, which exposes Python's introspection utilities — including `sys.modules` — thereby providing access to unfiltered system-level functionality like `os.system`. This vulnerability affects the Agenta self-hosted platform (API server), not the SDK when used as a standalone Python library. The custom code evaluator runs server-side within the API process. The issue is fixed in v0.48.1 by removing `numpy` from the sandbox allowlist. In later versions (v0.60+), the RestrictedPython sandbox was removed entirely and replaced with a different execution model.
Weakness: CWE-94
Which versions are affected by CVE-2026-27952?
1 open source package ship an affected version, including agenta. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
agenta PyPI | All versions | 0.48.1 |
Products include Agentatech Agenta.
How do I fix CVE-2026-27952?
Upgrade agenta to 0.48.1 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-27952 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27952 exists.
Other vulnerabilities in Agenta-AI agenta-api
Sources
Also known as GHSA-pmgp-2m3v-34mq, PYSEC-2026-6.