Secuno
ENNL
Book demo

CVE-2026-33897

Linuxcontainers Incus vulnerability

9.9 CRITICALEPSS 0.53%
  1. Published26 Mar 2026

Description

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 pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue.

CVSS 3.1 breakdown

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

Affected products

Linuxcontainers Incus< 6.23.0

Remediation

Fixed in
Linuxcontainers Incus≥ 6.23.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1096528.8
Frappe ERPNext before 15.119.1 and 16.x before 16.32.0 contains a server-side template…
CVE-2026-1093058.8
Craft CMS from 5.10.2 before 5.10.14 contains a Twig sandbox bypass that allows…
CVE-2026-1082649.1
Wizarr is an advanced user invitation and management system for Jellyfin, Plex, Emby,…
CVE-2026-672739.6
Dell Container Storage Modules, versions prior to 1.18.0, contain(s) an Improper…
CVE-2026-1059858.8
Craft CMS 5.10.13.2 contains an authenticated remote code execution vulnerability in…
CVE-2026-1048518.8
fsspec is a specification and Python implementation framework for filesystem…

Frequently asked

Is CVE-2026-33897 being actively exploited?

CVE-2026-33897 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.53%.

How severe is CVE-2026-33897?

CVE-2026-33897 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.53% probability of exploitation.

Which products are affected by CVE-2026-33897?

Affected products include Linuxcontainers Incus.

How do I fix CVE-2026-33897?

Upgrade affected software to a fixed version, for example Linuxcontainers Incus 6.23.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33897 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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