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CVE

CVE-2026-66898

Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE
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CVE

CVE-2026-66898

Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66898.json, https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984, https://nvd.nist.gov/vuln/detail/CVE-2026-66898, https://github.com/canonical/lxd

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.00344%
EPSS Percentile
0.27071%
Introduced Version
0
Fix Available
5a492a3f0036c44d22c344505952e06ce517993a

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