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CVE-2026-63293— Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root

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，该漏洞源于在处理镜像归档时未验证metadata.yaml文件是否为符号链接，攻击者可通过特制的镜像归档利用指向主机系统目标文件路径的符号链接，实现任意文件读取和写入操作。

CVSS 9.9 · Critical EPSS 0.59% · P46

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-2026-63293

Vulnerability Information
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Vulnerability Title
Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root
Source: CVE Program / CVE List V5
Vulnerability Description
A link following vulnerability in LXD allows an attacker to achieve arbitrary file read and write operations on the host system. When importing or unpacking an image archive, LXD fails to validate whether the metadata.yaml file is a symbolic link. An attacker can exploit this flaw by providing a crafted image archive with a symlinked metadata.yaml file pointing to target file paths on the host system.
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，该漏洞源于在处理镜像归档时未验证metadata.yaml文件是否为符号链接，攻击者可通过特制的镜像归档利用指向主机系统目标文件路径的符号链接，实现任意文件读取和写入操作。
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-2026-63293

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Qwen3.6-35B-A3B · 8408 chars
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III. Intelligence Information for CVE-2026-63293

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Vendor Advisories for CVE-2026-63293 (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-2026-63294 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-2026-66898 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-2026-63293

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