cloud-hypervisor Cloud Hypervisor up to 50.0 file inclusion

Summaryinfo

A vulnerability, which was classified as problematic, has been found in cloud-hypervisor Cloud Hypervisor up to 50.0. This issue affects some unknown processing. The manipulation leads to file inclusion. This vulnerability is referenced as CVE-2026-27211. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in cloud-hypervisor Cloud Hypervisor up to 50.0. This issue affects an unknown functionality. The manipulation with an unknown input leads to a file inclusion vulnerability. Using CWE to declare the problem leads to CWE-73. The product allows user input to control or influence paths or file names that are used in filesystem operations. Impacted is confidentiality. The summary by CVE is:

Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to arbitrary host file exfiltration (constrained by process privileges) when using virtio-block devices backed by raw images. A malicious guest can overwrite its disk header with a crafted QCOW2 structure pointing to a sensitive host path. Upon the next VM boot or disk scan, the image format auto-detection parses this header and serves the host file's contents to the guest. Guest-initiated VM reboots are sufficient to trigger a disk scan and do not cause the Cloud Hypervisor process to exit. Therefore, a single VM can perform this attack without needing interaction from the management stack. Successful exploitation requires the backing image to be either writable by the guest or sourced from an untrusted origin. Deployments utilizing only trusted, read-only images are not affected. This issue has been fixed in version 50.1. To workaround, enable land lock sandboxing and restrict process privileges and access.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-27211 since 02/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

Upgrading to version 50.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 081a6ebb5184228ff348601502258f3f72bd8b43 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Cloud Software

Vendor

• cloud-hypervisor

Name

• Cloud Hypervisor

Version

• 50.0

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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