CVE-2026-27952

HIGH
2026-02-26 [email protected]
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Mar 02, 2026 - 18:43 vuln.today
Public exploit code
CVE Published
Feb 26, 2026 - 02:16 nvd
HIGH 8.8

Tags

Python AI / ML Agenta

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.

Analysis

Arbitrary code execution in Agenta-API prior to version 0.48.1 allows authenticated users to escape the RestrictedPython sandbox through unsafe whitelisting of the numpy package, enabling execution of arbitrary system commands on the API server. The vulnerability leverages numpy.ma.core.inspect to access Python introspection utilities and bypass sandbox restrictions. …

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Remediation

Within 24 hours: Inventory all Agenta deployments and versions; disable or restrict access to custom code evaluator features if operationally feasible. Within 7 days: Implement network segmentation to isolate Agenta instances; enable enhanced logging and monitoring for suspicious code execution patterns; assess whether your version is below 0.48.1. …

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Priority Score

64
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +44
POC: +20

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CVE-2026-27952 vulnerability details – vuln.today
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