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CVE-2026-33945

Linuxcontainers Incus path traversal

9.9 CRITICALEPSS 0.53%
  1. Published26 Mar 2026

Description

Incus is a system container and virtual machine manager. Incus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory. Prior to version 6.23.0, an attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods. While it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks. Version 6.23.0 fixes 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

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Frequently asked

Is CVE-2026-33945 being actively exploited?

CVE-2026-33945 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.53%.

How severe is CVE-2026-33945?

CVE-2026-33945 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-2026-33945?

Affected products include Linuxcontainers Incus.

How do I fix CVE-2026-33945?

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-2026-33945 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.

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