VulnerabilityPublished 27 Sep 2026Updated 8 Oct 2026

CVE-2025-71422: edgelesssys contrast · Improper Verification of Cryptographic Signature

Affects edgelesssys contrastSource CVE Database V5

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Not known to be exploited · CVSS 6.9 Medium : upgrade to 1.12.1 when convenient.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS

0.07% chance of exploitation in 30 days – higher than 0% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-09-30.

Patch

Available – fixed in 1.12.1

CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Attack Vector: Adjacent
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: High
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Adjacent: The vulnerable system is bound to a protocol stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared proximity (e.g., Bluetooth, NFC, or IEEE 802.11) or logical network (e.g., local IP subnet), or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN within an administrative network zone).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade edgelesssys contrast to 1.12.1.

Affected software

Product	Affected	Fixed in
edgelesssyscontrast	Affected <1.12.1	Fixed in 1.12.1
Gocontrast`pkg:golang/contrast`Other threats	Affected <1.12.1	Fixed in 1.12.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Contrast to version 1.12.1 or later, which includes cryptsetup 2.8.1 that disables null ciphers in keyslots with non-empty passphrases. Further security improvements are available in version 1.13.0 with detached-header validation and integrity protection. No other mitigation is indicated by the vendor advisory.

Description

CVE-2025-71422 affects edgelesssys Contrast, a Kubernetes runtime for confidential containers, in versions before 1.12.1. The vulnerability involves improper verification of cryptographic signatures in the secure persistent volume feature. A malicious host can supply a crafted LUKS2 volume with a null keyslot encryption algorithm, causing the guest to open the volume and expose secret data in plaintext or under a key known to the attacker. Contrast 1.12.1 and later include fixes that disable null ciphers and add integrity protections.

Impact

An attacker controlling the host can supply a maliciously crafted LUKS2 volume that bypasses encryption protections, causing secret data within the pod VM to be exposed in plaintext or encrypted with a key known to the attacker. This compromises the confidentiality of data intended to be protected by Contrast's secure persistent volume feature. The vulnerability does not affect integrity due to lack of integrity protection in affected versions.

Summary

Contrast versions prior to 1.12.1 use cryptsetup versions before 2.8.1, which accept LUKS2 volume headers specifying the null keyslot encryption algorithm (cipher_null-ecb) without error. Since LUKS2 volume metadata is not authenticated, a malicious host can supply a crafted LUKS2 volume to a pod VM. The Contrast Initializer assumes the device is protected if `cryptsetup open` succeeds with the secret seed, leading to the guest opening the attacker-supplied volume and writing secret data in plaintext or under a volume key known to the attacker. This allows the host to read confidential data that should have been encrypted. Contrast v1.12.1 upgrades cryptsetup to 2.8.1, which disables null ciphers in keyslots when the passphrase is non-empty. Version 1.13.0 adds detached-header validation in guest memory and integrity protection for secure persistent storage. Since Contrast persistent volumes were not integrity protected before, integrity impact is not considered.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Nov 2026, 05:45 UTC

Technical details

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