CVE-2026-61422: Authenticated pre-validation SSRF vulnerability in Apache CloudStack's template and ISO registration functiona

Routine

MEDIUM 4.3WATCHLISTUPGRADE

CVE-2026-61422 is a medium-severity flaw (CVSS 4.3) affecting cloudstack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authenticated pre-validation SSRF vulnerability in Apache CloudStack's template and ISO registration functionality. When registering a template or ISO, CloudStack makes a live HTTP HEAD/GET call to determine file size for secondary storage usage-limit checks, and this happens before URL validation is performed. However, this does not pose a malicious template or ISO registration risk, as URL validation still occurs prior to the actual download b

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-08-21
Last modified	2026-10-16

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-21 09:16 UTCPublished CVE record published
2026-10-16 15:10 UTCUpdated Record last modified

apache cloudstack UPGRADE

Affected: >= 4.21.0.0 and < 4.22.1.1 · 4.20.3.0

Fixed in: 4.22.1.1

Safe to downgrade to: a release before 4.20.3.0

1. Check installed version

apt-cache policy cloudstack || rpm -q cloudstack || cloudstack --version

2. UPGRADE to 4.22.1.1 (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 4.20.3.0 (Debian / Ubuntu)

apt-cache madison cloudstack sudo apt install cloudstack=<VERSION_BEFORE_4.20.3.0> 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_4.20.3.0> 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-2026-61422?

cloudstack: upgrade to 4.22.1.1. Exact commands for each OS are on this page.

Is CVE-2026-61422 being exploited?

CVE-2026-61422 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-2026-61422 affect?

CVE-2026-61422 affects cloudstack. Severity is medium (CVSS 4.3). Authenticated pre-validation SSRF vulnerability in Apache CloudStack's template and ISO registration functionality. When registering a template or ISO, CloudStack makes a live HTTP HEAD/GET call to determine file size for secondary storage

How urgent is CVE-2026-61422?

Priority 29/100. On your watchlist

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References

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