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CVE-2026-62420— Cross-project cluster migration bypasses project restrictions via cluster notification flag

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 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之前版本存在授权问题漏洞，该漏洞源于在跨项目实例迁移过程中，通过POST /1.0/instances/{name}并设置migration、project、target参数时，请求作为内部集群通知到达目标节点，导致目标节点跳过所有项目限制检查，从而使经过身份验证的攻击者能够绕过目标项目的

CVSS 9.9 · Critical EPSS 0.54% · P43

Affected Version Matrix 3

VendorProduct Version RangeStatus
Canonical LXD 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-2026-62420

Vulnerability Information
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Vulnerability Title
Cross-project cluster migration bypasses project restrictions via cluster notification flag
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project security restrictions during cross-project instance migrations. When moving an instance cross-project to a different cluster member via POST /1.0/instances/{name} with migration: true, project: <target>, and target: <member>, the destination node skips all project restriction checks because the request arrives as an internal cluster notification. An attacker can exploit this to introduce disallowed instance configurations into a restricted project.
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
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 授权问题漏洞
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 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之前版本存在授权问题漏洞，该漏洞源于在跨项目实例迁移过程中，通过POST /1.0/instances/{name}并设置migration、project、target参数时，请求作为内部集群通知到达目标节点，导致目标节点跳过所有项目限制检查，从而使经过身份验证的攻击者能够绕过目标项目的
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 5.0.0 ~ 5.0.8 -

II. Public POCs for CVE-2026-62420

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8367 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-62420

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Patches & Fixes for CVE-2026-62420 (2)

Vendor Advisories for CVE-2026-62420 (1)

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

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-2026-16033 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-863

V. Comments for CVE-2026-62420

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