CVE-2026-27211: Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads

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CRITICAL 10.0REMOTEUPGRADE

CVE-2026-27211 is a critical-severity flaw (CVSS 10.0) affecting cloud hypervisor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-73
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: cloudhypervisor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-21 06:17 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

cloudhypervisor cloud hypervisor UPGRADE

Affected: >= 34.0 and < 50.1

Fixed in: 50.1

Safe to downgrade to: a release before 34.0

1. Check installed version

apt-cache policy cloud-hypervisor || rpm -q cloud-hypervisor || cloud-hypervisor --version

2. UPGRADE to 50.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cloud-hypervisor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cloud-hypervisor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 34.0 (Debian / Ubuntu)

apt-cache madison cloud-hypervisor sudo apt install cloud-hypervisor=<VERSION_BEFORE_34.0> sudo apt-mark hold cloud-hypervisor

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cloud-hypervisor sudo dnf downgrade cloud-hypervisor-<VERSION_BEFORE_34.0> sudo dnf versionlock add cloud-hypervisor

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27211?

cloud hypervisor: upgrade to 50.1. Exact commands for each OS are on this page.

Is CVE-2026-27211 being exploited?

CVE-2026-27211 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27211 affect?

CVE-2026-27211 affects cloud hypervisor. Severity is critical (CVSS 10.0). 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 mali

How urgent is CVE-2026-27211?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

References

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