How broadly exploitable is this vulnerability?

Exploitability is high wherever guests have writable access to the backing raw image or where images can be sourced from untrusted origins. In such setups, a single compromised or malicious VM can craft disk headers that cause the host hypervisor to expose sensitive host files. Deployments using only trusted, read-only images and strong file access restrictions significantly reduce this risk.

What level of access does an attacker need to leverage this issue?

An attacker needs the ability to control the content of the disk header used for auto-detection. This typically means: - write access from inside the guest to the virtual disk image (persisting changes), or - control over the supply chain that provides the image to the hypervisor. No direct access to the host is required; the attack is driven entirely from within the guest VM.

What is the safest general fix pattern?

The most robust fix pattern combines: - enforcing strict confinement of host file access for the hypervisor (using sandboxing and least-privilege accounts), - ensuring disk format handling does not trust guest-controlled headers to reference arbitrary host paths, and - binding backing file resolution to predefined directories or storage mechanisms that cannot be influenced by guest data. Together, these ensure that even if disk parsing is attacked, the hypervisor cannot open sensitive host files.

Severity:

CRITICAL RISK

(10.0)

Improper File Path Handling (CWE-73) in Cloud Hypervisor virtio-block Raw Image Auto-Detection

CVE-2026-27211

Published:

Feb 21, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Improper File Access Control via Path Handling

CWE:

CWE-73

Impact:

Arbitrary Host File Exfiltration (Guest-to-Host Information Disclosure)

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper File Access Control via Path Handling

CWE:

CWE-73

Impact:

Arbitrary Host File Exfiltration (Guest-to-Host Information Disclosure)

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Improper File Path Handling (CWE-73) in Cloud Hypervisor virtio-block Raw Image Auto-Detection

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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