CVE-2026-23954
CVE-2026-23954 · Incus container image templating arbitrary host file read and write
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Incus is a system container and virtual machine manager. Versions 6.21.0 and below allow a user with the ability to launch a container with a custom image (e.g a member of the ‘incus’ group) to use directory traversal or symbolic links in the templating functionality to achieve host arbitrary file read, and host arbitrary file write. This ultimately results in arbitrary command execution on the host. When using an image with a metadata.yaml containing templates, both the source and target paths are not checked for symbolic links or directory traversal. This can also be exploited in IncusOS. A fix is planned for versions 6.0.6 and 6.21.0, but they have not been released at the time of publication.
CVSS 8.7 · High · EPSS 0.8% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
incus
- Versions
- >= 6.1.0, <= 6.20.0: Affected
- <= 6.0.5: Affected
No fix published
incus Debian:13
- Versions
- 6.0.4-2
- 6.0.4-2+deb13u1
- 6.0.4-2+deb13u1~bpo12+1
- 6.0.4-2+deb13u2
- 6.0.4-2+deb13u2~bpo12+1
- 6.0.4-2+deb13u3
- 6.0.4-2+deb13u3~bpo12+1
- 6.0.4-2+deb13u4~bpo12+1
- Affected ranges
- ECOSYSTEM: < 6.0.4-2+deb13u4
Update to 6.0.4-2+deb13u4
incus Debian:14
- Versions
- 6.0.4-2
- 6.0.4-3
- 6.0.5-1
- 6.0.5-2
- 6.0.5-3
- 6.0.5-4
- 6.0.5-5
- 6.0.5-6
- 6.0.5-7
- Affected ranges
- ECOSYSTEM: < 6.0.5-8
Update to 6.0.5-8
lxd Debian:12
- Versions
- 5.0.2+git20231211.1364ae4-1
- 5.0.2+git20231211.1364ae4-2
- 5.0.2+git20231211.1364ae4-3
- 5.0.2+git20231211.1364ae4-4
- 5.0.2+git20231211.1364ae4-5
- 5.0.2+git20231211.1364ae4-6
- 5.0.2+git20231211.1364ae4-7
- 5.0.2+git20231211.1364ae4-8
- 5.0.2+git20231211.1364ae4-9
- 5.0.2-5
- 5.0.2-5+deb12u1
- 5.0.2-5+deb12u2
- 5.0.2-5+deb12u3
- 5.0.2-5+deb12u4
- 5.0.2-5+deb12u5
- 5.0.2-5+deb12u6
- 5.0.2-6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lxd Debian:13
- Versions
- 5.0.2+git20231211.1364ae4-9
- 5.0.2+git20231211.1364ae4-9+deb13u1
- 5.0.2+git20231211.1364ae4-9+deb13u2
- Affected ranges
- ECOSYSTEM: < 5.0.2+git20231211.1364ae4-9+deb13u3
Update to 5.0.2+git20231211.1364ae4-9+deb13u3
lxd Ubuntu:Pro:16.04:LTS
- Versions
- 0.20-0ubuntu4
- 0.21-0ubuntu3
- 0.21-0ubuntu5
- 0.22-0ubuntu1
- 0.22-0ubuntu2
- 0.23-0ubuntu1
- 0.23-0ubuntu2
- 0.23-0ubuntu3
- 0.24-0ubuntu2
- 0.24-0ubuntu3
- 0.24-0ubuntu4
- 0.25-0ubuntu1
- 0.26-0ubuntu2
- 0.26-0ubuntu3
- 0.27-0ubuntu1
- 0.27-0ubuntu2
- 2.0.0~beta1-0ubuntu3
- 2.0.0~beta1-0ubuntu4
- 2.0.0~beta2-0ubuntu1
- 2.0.0~beta2-0ubuntu2
- 2.0.0~beta3-0ubuntu1
- 2.0.0~beta3-0ubuntu2
- 2.0.0~beta3-0ubuntu3
- 2.0.0~beta3-0ubuntu4
- 2.0.0~beta4-0ubuntu1
- 2.0.0~beta4-0ubuntu2
- 2.0.0~beta4-0ubuntu3
- 2.0.0~beta4-0ubuntu4
- 2.0.0~beta4-0ubuntu5
- 2.0.0~beta4-0ubuntu6
- 2.0.0~beta4-0ubuntu7
- 2.0.0~rc1-0ubuntu1
- 2.0.0~rc1-0ubuntu2
- 2.0.0~rc1-0ubuntu3
- 2.0.0~rc2-0ubuntu2
- 2.0.0~rc2-0ubuntu3
- 2.0.0~rc3-0ubuntu1
- 2.0.0~rc3-0ubuntu2
- 2.0.0~rc3-0ubuntu3
- 2.0.0~rc3-0ubuntu4
- 2.0.0~rc4-0ubuntu1
- 2.0.0~rc5-0ubuntu1
- 2.0.0~rc6-0ubuntu1
- 2.0.0~rc6-0ubuntu2
- 2.0.0~rc7-0ubuntu1
- 2.0.0~rc7-0ubuntu2
- 2.0.0~rc8-0ubuntu1
- 2.0.0~rc8-0ubuntu2
- 2.0.0~rc8-0ubuntu3
- 2.0.0~rc8-0ubuntu5
- 2.0.0~rc8-0ubuntu6
- 2.0.0~rc8-0ubuntu7
- 2.0.0~rc9-0ubuntu2
- 2.0.0~rc9-0ubuntu3
- 2.0.0~rc9-0ubuntu4
- 2.0.0~rc9-0ubuntu5
- 2.0.0-0ubuntu1
- 2.0.0-0ubuntu2
- 2.0.0-0ubuntu3
- 2.0.0-0ubuntu4
- 2.0.1-0ubuntu1~16.04.1
- 2.0.2-0ubuntu1~16.04.1
- 2.0.3-0ubuntu1~ubuntu16.04.2
- 2.0.4-0ubuntu1~ubuntu16.04.1
- 2.0.5-0ubuntu1~ubuntu16.04.1
- 2.0.8-0ubuntu1~ubuntu16.04.1
- 2.0.8-0ubuntu1~ubuntu16.04.2
- 2.0.9-0ubuntu1~16.04.1
- 2.0.9-0ubuntu1~16.04.2
- 2.0.10-0ubuntu1~16.04.1
- 2.0.10-0ubuntu1~16.04.2
- 2.0.11-0ubuntu1~16.04.2
- 2.0.11-0ubuntu1~16.04.4
- 2.0.11-0ubuntu1~16.04.4+esm1
- 2.0.11-0ubuntu1~16.04.4+esm2
- 2.0.11-0ubuntu1~16.04.4+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lxd Ubuntu:Pro:18.04:LTS
- Versions
- 2.18-0ubuntu6
- 2.19-0ubuntu1
- 2.20-0ubuntu3
- 2.20-0ubuntu4
- 2.21-0ubuntu1
- 2.21-0ubuntu2
- 2.21-0ubuntu3
- 2.21-0ubuntu4
- 3.0.0~beta2-0ubuntu3
- 3.0.0~beta3-0ubuntu3
- 3.0.0~beta5-0ubuntu2
- 3.0.0~beta7-0ubuntu1
- 3.0.0-0ubuntu1
- 3.0.0-0ubuntu2
- 3.0.0-0ubuntu3
- 3.0.0-0ubuntu4
- 3.0.1-0ubuntu1~18.04.1
- 3.0.2-0ubuntu1~18.04.1
- 3.0.3-0ubuntu1~18.04.1
- 3.0.3-0ubuntu1~18.04.2
- 3.0.3-0ubuntu1~18.04.2+esm1
- 3.0.3-0ubuntu1~18.04.2+esm2
- 3.0.3-0ubuntu1~18.04.2+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lxd Ubuntu:20.04:LTS
- Versions
- 1:0.7
- 1:0.8
- 1:0.9
- 1:0.10
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
incus Ubuntu:Pro:24.04:LTS
- Versions
- 0.4-1ubuntu1
- 0.5.1-1
- 0.5.1-3
- 0.6-1
- 6.0.0-1
- 6.0.0-1ubuntu0.1
- 6.0.0-1ubuntu0.2
- 6.0.0-1ubuntu0.2+esm1
- 6.0.0-1ubuntu0.3
- 6.0.0-1ubuntu0.3+esm1
- 6.0.0-1ubuntu0.3+esm2
- 6.0.0-1ubuntu0.3+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
incus Ubuntu:25.10
- Versions
- 6.0.3-4
- 6.0.4-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
incus Ubuntu:Pro:26.04:LTS
- Versions
- 6.0.4-2
- 6.0.5-8
- 6.0.5-8ubuntu0.26.04.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://github.com/lxc/incus/security/advisories/GHSA-7f67-crqm-jgh7
- https://github.com/lxc/incus/blob/HEAD/internal/server/instance/drivers/driver_lxc.go#L7215
- https://github.com/lxc/incus/blob/HEAD/internal/server/instance/drivers/driver_lxc.go#L7294
- https://github.com/user-attachments/files/24473599/template_arbitrary_write.sh
- https://github.com/user-attachments/files/24473601/templates_arbitrary_write.patch
- https://nvd.nist.gov/vuln/detail/CVE-2026-23954