CVE-2026-66897
Last modified
CVE-2026-66897 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. 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. EPSS estimates a 0.62% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Lxd | < 4.0.13 |
| Canonical | Lxd | >= 5.0.0, < 5.0.9 |
| Canonical | Lxd | >= 5.1, < 5.21.7 |
| Canonical | Lxd | >= 6.0, <= 6.9 |
References
- https://github.com/canonical/lxd/security/advisories/GHSA-q39m-8fx9-42fvVendor Advisory, Exploit
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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