What is CVE-2026-27952?

CVE-2026-27952 is a high-severity vulnerability in Agenta-Ai Agenta-Api, classified under Code Injection. CVSS score: 8.8/10. Published 2026-02-26.

How severe is CVE-2026-27952?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Agenta-Ai Agenta-Api

CVE-2026-27952

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.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-02-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002

Affected products

Agenta-Ai Agenta-Api — versions < 0.48.1
Agentatech Agenta

Weakness classification (CWE)

CWE-94 — Code Injection

References

github.com/Agenta-AI/agenta/security/advisories/GHSA-pmgp-2m3v-34mq (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27952?: CVE-2026-27952 is a high-severity vulnerability in Agenta-Ai Agenta-Api, classified under Code Injection. CVSS score: 8.8/10. Published 2026-02-26.
How severe is CVE-2026-27952?: High severity. CVSS v3 base score is 8.8 out of 10.