---
id: CVE-2025-71422
title: Contrast is a Kubernetes runtime for confidential containers
summary: >-
  Contrast is a Kubernetes runtime for confidential containers. In versions
  before 1.12.1, the secure persistent volume feature is vulnerable to a
  malicious host supplying a crafted LUKS2 volume to a pod VM. LUKS2 volume
  metadata is not au…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-347
vendor: edgelesssys
product: contrast
affected:
  - contrast < 1.12.1
published: '2026-09-27'
updated: '2026-09-27'
sourceUpdated: '2026-09-27T02:17:11.040'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-71422'
references:
  - url: >-
      https://github.com/edgelesssys/contrast/security/advisories/GHSA-f5p4-p5q5-jv3h
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/contrast-before-1.12.1-insecure-luks2-persistent-storage
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-27T02:41:45.560Z'
---

## Overview

Contrast is a Kubernetes runtime for confidential containers. In versions before 1.12.1, the secure persistent volume feature is vulnerable to a malicious host supplying a crafted LUKS2 volume to a pod VM. LUKS2 volume metadata is not authenticated and, with cryptsetup versions prior to 2.8.1, a header specifying the null keyslot encryption algorithm (cipher_null-ecb) is accepted without error. Because the Contrast Initializer assumes a device is protected if `cryptsetup open` succeeds with the secret seed, the guest will open the attacker-supplied volume and write secret data in plaintext, or under a volume key known to the attacker, allowing the host to read confidential data that should have been encrypted. Contrast v1.12.1 ships cryptsetup 2.8.1, which disables null ciphers in keyslots when the passphrase is non-empty; v1.13.0 adds detached-header validation in guest memory and integrity protection for secure persistent storage. Contrast persistent volumes were not integrity protected, so integrity impact is not considered.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.