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CVE-2026-63294— Root RCE via image backup.yaml symlink

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 4.0.0至4.0.12之前版本、5.0.0至5.0.8之前版本、5.21.0至5.21.6之前版本和6.0至6.10之前版本存在后置链接漏洞，该漏洞源于在处理特制镜像或备份归档的导入或解压过程中，未正确验证和限制backup.yaml符号链接，导致处理未受限制的配置元数据，攻击者可利用恶意归档中的符号链接backup.yaml文件以root权限执行任意命令。

CVSS 9.9 · Critical EPSS 0.88% · P58

Affected Version Matrix 4

VendorProduct Version RangeStatus
Canonical LXD 4.0.0< 4.0.12 affected
5.0.0< 5.0.8 affected
5.21.0< 5.21.6 affected
6.0< 6.10 affected
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I. Basic Information for CVE-2026-63294

Vulnerability Information
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Vulnerability Title
Root RCE via image backup.yaml symlink
Source: CVE Program / CVE List V5
Vulnerability Description
A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges.
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
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 后置链接漏洞
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 4.0.0至4.0.12之前版本、5.0.0至5.0.8之前版本、5.21.0至5.21.6之前版本和6.0至6.10之前版本存在后置链接漏洞，该漏洞源于在处理特制镜像或备份归档的导入或解压过程中，未正确验证和限制backup.yaml符号链接，导致处理未受限制的配置元数据，攻击者可利用恶意归档中的符号链接backup.yaml文件以root权限执行任意命令。
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-2026-63294

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Qwen3.6-35B-A3B · 7580 chars
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III. Intelligence Information for CVE-2026-63294

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Vendor Advisories for CVE-2026-63294 (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-2026-63297 9.9 CRITICAL Cross-project instance copy bypasses target project restrictions via TOCTOU in config merg
CVE-2026-66898 9.9 CRITICAL Path traversal via unvalidated instance name in backup tarball restore enables root file w
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-59

V. Comments for CVE-2026-63294

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