CVE-2026-27952 - Agenta has Python Sandbox Escape, Leading to Remote Code Execution (RCE)

CVE-2026-27952 - Agenta has Python Sandbox Escape, Leading to Remote Code Execution (RCE)

https://cvefeed.io/rssfeed/latest.atom / Thu, 02/26/2026 - 05:03
CVE ID : CVE-2026-27952
Published : Feb. 26, 2026, 1:38 a.m. | 46 minutes ago
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.
Severity: 0.0 | NA
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