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CVE-2026-27211

Cloudhypervisor Cloud Hypervisor path traversal

10.0 CRITICALEPSS 0.62%
  1. Published21 Feb 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Cloudhypervisor Cloud Hypervisor≥ 34.0 < 50.1

Remediation

Fixed in
Cloudhypervisor Cloud Hypervisor≥ 50.1

References

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Frequently asked

Is CVE-2026-27211 being actively exploited?

CVE-2026-27211 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.62%.

How severe is CVE-2026-27211?

CVE-2026-27211 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.62% probability of exploitation.

Which products are affected by CVE-2026-27211?

Affected products include Cloudhypervisor Cloud Hypervisor.

How do I fix CVE-2026-27211?

Upgrade affected software to a fixed version, for example Cloudhypervisor Cloud Hypervisor 50.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27211 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.