CVE-2026-33897: Incus is a system container and virtual machine manager

Q: How do I fix CVE-2026-33897?

incus: upgrade to 6.23.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33897 being exploited?

CVE-2026-33897 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33897 affect?

CVE-2026-33897 affects incus. Severity is critical (CVSS 9.9). Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can

Q: How urgent is CVE-2026-33897?

Priority 50/100. Critical severity; On your watchlist

This month

CRITICAL 9.9WATCHLISTUPGRADE

CVE-2026-33897 is a critical-severity flaw (CVSS 9.9) affecting incus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the

Why this priority

Critical severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-1336
Published	2026-03-26
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-03-26 23:16 UTCPublished CVE record published
2026-06-17 10:38 UTCUpdated Record last modified

linuxcontainers incus UPGRADE

Affected: < 6.23.0

Fixed in: 6.23.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 6.23.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade incus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade incus

Note

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

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-2026-33897?

incus: upgrade to 6.23.0. Exact commands for each OS are on this page.

Is CVE-2026-33897 being exploited?

CVE-2026-33897 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-2026-33897 affect?

CVE-2026-33897 affects incus. Severity is critical (CVSS 9.9). Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can

How urgent is CVE-2026-33897?

Priority 50/100. Critical severity; On your watchlist

Related CVEs

CVE-2026-41648 MEDIUM 5.0 UPGRADE Incus is a system container and virtual machine manager
CVE-2026-41647 MEDIUM 6.5 UPGRADE Incus is a system container and virtual machine manager
CVE-2026-41684 MEDIUM 6.5 UPGRADE Incus is a system container and virtual machine manager
CVE-2026-41685 MEDIUM 4.3 UPGRADE Incus is a system container and virtual machine manager
CVE-2026-40195 MEDIUM 6.5 UPGRADE Incus is a system container and virtual machine manager

References

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