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CVE-2026-66897

Canonical Lxd path traversal

9.9 CRITICALPublic exploitEPSS 0.72%
  1. Published24 Aug 2026

Description

A path traversal vulnerability in LXD's instance template processing allows an attacker with container edit permissions, or any user launching a crafted image, to overwrite arbitrary files on the host system as root. When processing target template paths specified in metadata.yaml, LXD validates the path against a confined os.Root directory handle but subsequently opens and creates the file using os.Create with an unconfined string path. This discrepancy between path resolution checks and file creation allows an attacker to escape directory confinement, overwrite root-owned host files, and achieve host root code execution.

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

Canonical Lxd≥ 5.0.0 < 5.0.9 · ≥ 5.1 < 5.21.7 · ≥ 6.0 ≤ 6.9 · < 4.0.13

Remediation

Fixed in
Canonical Lxd≥ 5.0.9

References

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Frequently asked

Is CVE-2026-66897 being actively exploited?

CVE-2026-66897 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-66897?

CVE-2026-66897 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-66897?

Affected products include Canonical Lxd.

How do I fix CVE-2026-66897?

Upgrade affected software to a fixed version, for example Canonical Lxd 5.0.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-66897 against the real software inventory on every managed device, as each hourly inventory arrives. 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.