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CVE-2026-16033— Arbitrary file read+write on host via templates/ symlink in malicious image

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之前版本和5.0.0至5.0.8之前版本存在路径遍历漏洞，该漏洞源于路径遍历攻击，处理镜像元数据模板时未能正确清理或限制模板文件路径，可能导致攻击者利用特制镜像存档中的恶意模板指令实现任意主机文件读取或不受限制的文件创建。

CVSS 8.5 · High EPSS 0.35% · P26

Affected Version Matrix 2

VendorProduct Version RangeStatus
Canonical LXD 4.0.0< 4.0.12 affected
5.0.0< 5.0.8 affected
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I. Basic Information for CVE-2026-16033

Vulnerability Information
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Vulnerability Title
Arbitrary file read+write on host via templates/ symlink in malicious image
Source: CVE Program / CVE List V5
Vulnerability Description
A path traversal vulnerability in LXD allows an attacker to achieve arbitrary host file read or unconstrained file creation. When processing image metadata templates, LXD fails to properly sanitize or restrict template file paths from escaping the instance templates directory (specifically affecting virtual machine / QEMU driver execution paths). An attacker can exploit this flaw by providing a crafted image archive with malicious template directives containing path traversal sequences, causing LXD to access or write files outside the intended template directory 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:L/A:N
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 4.0.0至4.0.12之前版本和5.0.0至5.0.8之前版本存在路径遍历漏洞，该漏洞源于路径遍历攻击，处理镜像元数据模板时未能正确清理或限制模板文件路径，可能导致攻击者利用特制镜像存档中的恶意模板指令实现任意主机文件读取或不受限制的文件创建。
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-2026-16033

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8302 chars
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III. Intelligence Information for CVE-2026-16033

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Vendor Advisories for CVE-2026-16033 (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-2026-66898 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-2026-63295 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-2026-16033

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