Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-66898

CVE-2026-66898CRITICAL

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  C  H  H  H    9.9   .0059   46.4     —

AFFECTED
  Product  Versions  Fixed
  LXD      4.0.0 –   —

TIMELINE
  Jul 28  Reserved by canonical
  Aug 12  Published (CNA: canonical)
  Sep 11  EXPLOIT PUBLISHED — CVE-2026-66898 (Canonical LXD). Public exploit reference added.

CWE-22 · CNA: canonical · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 28, 2026	Reserved	Reserved by canonical
August 12, 2026	Published	Published (CNA: canonical)
September 11, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66898 (Canonical LXD). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Canonical	LXD	—	4.0.0	—

Weaknesses

CWE-22

References (1)

https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984 [Vendor Advisory, Exploit, Mitigation]

Authoritative record: CVE-2026-66898 at cve.org

Vendors: canonical

Weaknesses: CWE-22

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66898 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.