# 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. - **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 26 Feb 2026 - **Updated:** 26 Feb 2026 - **Also known as:** GHSA-pmgp-2m3v-34mq, PYSEC-2026-6 ## 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 (Improper Control of Generation of Code) ## Which versions are affected by CVE-2026-27952? 1 open source package ship an affected version, including agenta. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `agenta` | PyPI | All versions | 0.48.1 | Products: Agentatech Agenta. ## How do I fix CVE-2026-27952? Upgrade agenta to 0.48.1 or later. ## 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 - [CVE-2026-27961](https://insights.sbomify.com/CVE-2026-27961/): Agenta's Server-Side Template Injection (SSTI) via custom evaluator Jinja2 templates allows RCE (high 8.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-27952 and fix it if it is affected. What it is: 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. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27952 exists. Affected packages and fixed versions: - agenta (PyPI): affected all versions; fixed in 0.48.1 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-27952/ (Markdown: https://insights.sbomify.com/CVE-2026-27952/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27952 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27952 - OSV: https://osv.dev/vulnerability/CVE-2026-27952 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-27952/ Summaries are generated and may contain mistakes; the official description above is the record.