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CVE-2026-62313— Incus: Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `security.idmap.isolated`

CVSS 4.3 · Medium EPSS 0.36% · P29

Possible ATT&CK Techniques 1AI

T1548.001 · Setuid and Setgid

Affected Version Matrix 1

VendorProductVersion RangeStatus
lxcincus< 7.3.0affected
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I. Basic Information for CVE-2026-62313

Vulnerability Information
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Vulnerability Title
Incus: Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `security.idmap.isolated`
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Prior to version 7.3.0, project-level enforcement of `restricted.containers.privilege=isolated` can be trivially bypassed, allowing a user to create a non-isolated (shared host idmap) container in a project that is configured to forbid them. The restriction only rejects an explicitly set `security.idmap.isolated=false` (or empty) and fails to enforce anything when the key is omitted entirely. Because an unset `security.idmap.isolated` defaults to `false` (non-isolation), a user simply leaves the key out and obtains exactly the container state the restriction is meant to forbid. This defeats the tenant-isolation guarantee the restriction exists to provide. Containers in the project share the host uid/gid map instead of receiving unique, non-overlapping ranges, weakening the isolation boundary between co-tenant containers and the host. Version 7.3.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
lxcincus < 7.3.0 -

II. Public POCs for CVE-2026-62313

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III. Intelligence Information for CVE-2026-62313

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Vendor Advisories for CVE-2026-62313 (1)

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

CVE-2026-629419.9 CRITICALIncus: Cross-project instance copy bypasses target project restrictions via TOCTOU in conf
CVE-2026-633439.9 CRITICALArbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as
CVE-2026-631259.9 CRITICALIncus vulnerable to root RCE via image backup.yaml symlink
CVE-2026-487699.9 CRITICALIncus has an arbitrary file write on its client due to trusted image hash
CVE-2026-487559.9 CRITICALIncus has an argument injection in backup compression algorithm leading to AFW and ACE
CVE-2026-628679.9 CRITICALIncus has an argument injection in storage volume block.create_options that leads to arbit
CVE-2026-629409.9 CRITICALIncus has a project restriction bypass via instance migration config override
CVE-2026-487529.9 CRITICALIncus has arbitrary file read+write on host via templates/ symlink in malicious image
CVE-2026-487519.9 CRITICALIncus has a restricted project bypass leading to arbitrary command execution
CVE-2026-487539.9 CRITICALIncus has an arbitrary file write via path traversal in S3 multipart upload
CVE-2026-487499.9 CRITICALIncus has an arbitrary file read+write on host via rootfs/ symlink in malicious image
CVE-2026-487509.9 CRITICALIncus has an arbitrary file write on host via `exec-output` symlink in crafted image
CVE-2026-556217.7 HIGHIncus has a project restriction bypass for custom volume copy across projects
CVE-2026-556227.7 HIGHIncus has a project restriction bypass in instance copy across projects
CVE-2026-477534.4 MEDIUMIncus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)
CVE-2026-487542.1 LOWIncus: Nil-pointer dereference in createDependentVolumesFromBackup on disk.{Volume,VolumeS
CVE-2026-487562.1 LOWIncus: CreateCustomVolumeFromBackup nil-pointer dereference on volume_snapshots[*].expires

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-863

V. Comments for CVE-2026-62313

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