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CVE-2026-25077: Account users are allowed by default to register templates to be downloaded directly to the primary storage fo

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HIGH 8.8WATCHLISTUPGRADE

CVE-2026-25077 is a high-severity flaw (CVSS 8.8) affecting cloudstack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Account users are allowed by default to register templates to be downloaded directly to the primary storage for deploying instances using the KVM hypervisor. Due to missing file name sanitization, an attacker can register malicious templates to execute arbitrary code on the KVM hosts. This can result in the compromise of resource integrity and confidentiality, data loss, denial of service, and availability of the KVM-based infrastructure managed

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.7% (top 46%)
CISA exploited listNo
WeaknessCWE-94
Published2026-05-08
Last modified2026-10-26
Publisher (CNA): Apache Software Foundation · Vendor: apache

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Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apache cloudstack UPGRADE
Affected: >= 4.11.0.0 and < 4.20.3.0 · >= 4.21.0.0 and < 4.22.0.1
Fixed in: 4.20.3.0, 4.22.0.1
Safe to downgrade to: a release before 4.11.0.0
1. Check installed version
apt-cache policy cloudstack || rpm -q cloudstack || cloudstack --version
2. UPGRADE to 4.20.3.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade cloudstack
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade cloudstack
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 4.11.0.0 (Debian / Ubuntu)
apt-cache madison cloudstack sudo apt install cloudstack=<VERSION_BEFORE_4.11.0.0> sudo apt-mark hold cloudstack
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list cloudstack sudo dnf downgrade cloudstack-<VERSION_BEFORE_4.11.0.0> sudo dnf versionlock add cloudstack
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-2026-25077?

cloudstack: upgrade to 4.20.3.0, 4.22.0.1. Exact commands for each OS are on this page.

Is CVE-2026-25077 being exploited?

CVE-2026-25077 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-2026-25077 affect?

CVE-2026-25077 affects cloudstack. Severity is high (CVSS 8.8). Account users are allowed by default to register templates to be downloaded directly to the primary storage for deploying instances using the KVM hypervisor. Due to missing file name sanitization, an attacker can register malicious template

How urgent is CVE-2026-25077?

Priority 49/100. High severity; On your watchlist

Related CVEs

References

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