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CVE-2026-66898— Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE

Quick assessment

Affected
Canonical LXD
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD 4.0.12之前版本、5.0.4之前版本、5.21.2之前版本和6.1之前版本存在路径遍历漏洞，该漏洞源于备份导入和恢复操作期间未验证实例和存储卷名称，可能导致攻击者通过包含路径遍历序列的恶意备份文件访问或覆盖指定恢复目录以外的文件。

CVSS 9.9 · Critical EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes

Affected Version Matrix 4

VendorProduct Version RangeStatus
Canonical LXD 4.0.0< 4.0.12 affected
5.0.0< 5.0.4 affected
5.21.0< 5.21.2 affected
6.0< 6.1 affected
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I. Basic Information for CVE-2026-66898

Vulnerability Information
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Vulnerability Title
Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD 4.0.12之前版本、5.0.4之前版本、5.21.2之前版本和6.1之前版本存在路径遍历漏洞，该漏洞源于备份导入和恢复操作期间未验证实例和存储卷名称，可能导致攻击者通过包含路径遍历序列的恶意备份文件访问或覆盖指定恢复目录以外的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical LXD 4.0.0 ~ 4.0.12 -

II. Public POCs for CVE-2026-66898

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7209 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-66898

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Vendor Advisories for CVE-2026-66898 (1)

Same Patch Batch · Canonical · 2026-08-12 · 11 CVEs total

CVE-2026-62420 9.9 CRITICAL Cross-project cluster migration bypasses project restrictions via cluster notification fla
CVE-2026-63300 9.9 CRITICAL Cross-project instance move bypasses all project restrictions allowing host command execut
CVE-2026-63296 9.9 CRITICAL Project restriction bypass via instance migration config override
CVE-2026-63293 9.9 CRITICAL Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as
CVE-2026-63294 9.9 CRITICAL Root RCE via image backup.yaml symlink
CVE-2026-63297 9.9 CRITICAL Cross-project instance copy bypasses target project restrictions via TOCTOU in config merg
CVE-2026-63298 8.7 HIGH LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration
CVE-2026-63299 8.5 HIGH Storage volume cross-project move and snapshot restore bypass project disk limits
CVE-2026-16033 8.5 HIGH Arbitrary file read+write on host via templates/ symlink in malicious image
CVE-2026-63295 4.3 MEDIUM Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `sec

IV. Related Vulnerabilities

Same product: LXD
Same vendor: Canonical
Same weakness: CWE-22

V. Comments for CVE-2026-66898

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