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CVE-2026-55621— Incus has a project restriction bypass for custom volume copy across projects

Quick assessment

Affected
lxc incus
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.

Incus 是一款系统容器和虚拟机管理工具。在 7.2.0 版本之前，存在自定义卷复制操作中缺少授权检查的安全漏洞。如果攻击者知道其无权访问的项目名称，以及该项目中某个自定义卷的名称，就可以将该自定义卷复制到新的项目中。此问题可能导致攻击者访问其未授权访问的自定义卷中的敏感信息。该问题已在 7.2.0 版本中得到修复。

CVSS 7.7 · High EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.2.0 affected
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I. Basic Information for CVE-2026-55621

Vulnerability Information
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Vulnerability Title
Incus has a project restriction bypass for custom volume copy across projects
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Prior to version 7.2.0, missing authorization checks exist for custom volume copying where an attacker knowing the name of a project that they don't have access to and the name of a custom volume in that project can copy the custom volume to a new project. This issue could allow an attacker to access secrets in custom volumes they are not authorized to access. Version 7.2.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus < 7.2.0 -

II. Public POCs for CVE-2026-55621

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8519 chars
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III. Intelligence Information for CVE-2026-55621

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Vendor Advisories for CVE-2026-55621 (1)

Same Patch Batch · lxc · 2026-08-21 · 18 CVEs total

CVE-2026-62940 9.9 CRITICAL Incus has a project restriction bypass via instance migration config override
CVE-2026-63343 9.9 CRITICAL Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as
CVE-2026-63125 9.9 CRITICAL Incus vulnerable to root RCE via image backup.yaml symlink
CVE-2026-48769 9.9 CRITICAL Incus has an arbitrary file write on its client due to trusted image hash
CVE-2026-48755 9.9 CRITICAL Incus has an argument injection in backup compression algorithm leading to AFW and ACE
CVE-2026-62867 9.9 CRITICAL Incus has an argument injection in storage volume block.create_options that leads to arbit
CVE-2026-62941 9.9 CRITICAL Incus: Cross-project instance copy bypasses target project restrictions via TOCTOU in conf
CVE-2026-48752 9.9 CRITICAL Incus has arbitrary file read+write on host via templates/ symlink in malicious image
CVE-2026-48751 9.9 CRITICAL Incus has a restricted project bypass leading to arbitrary command execution
CVE-2026-48753 9.9 CRITICAL Incus has an arbitrary file write via path traversal in S3 multipart upload
CVE-2026-48749 9.9 CRITICAL Incus has an arbitrary file read+write on host via rootfs/ symlink in malicious image
CVE-2026-48750 9.9 CRITICAL Incus has an arbitrary file write on host via `exec-output` symlink in crafted image
CVE-2026-55622 7.7 HIGH Incus has a project restriction bypass in instance copy across projects
CVE-2026-47753 4.4 MEDIUM Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)
CVE-2026-62313 4.3 MEDIUM Incus: Project restriction `restricted.containers.privilege=isolated` bypassable by omitti
CVE-2026-48754 2.1 LOW Incus: Nil-pointer dereference in createDependentVolumesFromBackup on disk.{Volume,VolumeS
CVE-2026-48756 2.1 LOW Incus: CreateCustomVolumeFromBackup nil-pointer dereference on volume_snapshots[*].expires

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-284

V. Comments for CVE-2026-55621

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