Vulnerability in Edgelesssys Contrast
CVE-2025-71422
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (0.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-f5p4-p5q5-jv3h) (vendor-advisory)
- VulnCheck Advisory: Contrast before 1.12.1 Insecure LUKS2 Persistent Storage (third-party-advisory)
Frequently asked questions
- What is CVE-2025-71422?
- CVE-2025-71422 is a medium-severity vulnerability in Edgelesssys Contrast, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.7/10. Published 2026-09-27.
- How severe is CVE-2025-71422?
- Medium severity. CVSS v3 base score is 5.7 out of 10.