---
id: "CVE-2026-127080"
page: "https://infrastack.ai/live/CVE-2026-127080"
kind: "vulnerability"
aliases: ["CVE-2026-127080"]
title: "OpsTree BuildPiper: deploy users can mount host root filesystem read-write"
severity: "critical"
cvss: 9.9
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["buildpiper", "ci-cd", "kubernetes", "other"]
not_affected_if: ["buildpiper-2.7.0-or-later"]
published_at: "2026-11-13T10:18:04+00:00"
first_seen_at: "2026-11-13T10:47:29+00:00"
updated_at: "2026-11-13T10:48:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-127080", "first_seen_at": "2026-11-13T10:47:29+00:00"}]
exploit_sources: []
---

# OpsTree BuildPiper: deploy users can mount host root filesystem read-write

Link for people: https://infrastack.ai/live/CVE-2026-127080 (this .md is for agents)

BuildPiper before 2.7.0 lets authenticated deploy users define arbitrary Kubernetes hostPath volumes without allow-list or policy checks. An attacker can mount the worker node's root filesystem read-write, breaking container isolation and enabling node and cluster compromise.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed BuildPiper version against the fixed release, `2.7.0`.
- Review whether deploy users can set hostPath volumes in the Define HostPath Volume configuration.

## Fix

- BuildPiper: move to `2.7.0` or later.

## Timeline

- 2026-11-13T10:47:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-127080

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-container-escape-via-unrestricted-hostpath-volumes

## From the sources

OpsTree BuildPiper before 2.7.0 contains an improper authorization vulnerability that allows authenticated deploy users to define arbitrary Kubernetes hostPath volumes without allow-list or policy checks. Attackers can set the host path to / in the Define HostPath Volume configuration to mount the worker node root filesystem read-write, breaking container isolation and enabling node and cluster compromise.

---

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