CVE-2026-40195 Incus nil-pointer dereference in storage bucket import allows denial of service
An authenticated user can crash the Incus daemon by importing a storage bucket with a malformed index.yaml file, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40195?
CVE-2026-40195 is a high-severity vulnerability in lxc incus, published on 6 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Incus is a system container and virtual machine manager. In versions before 7.0.0, missing validation logic in the storage bucket import logic allows an authenticated user with access to the storage bucket feature to cause the Incus daemon to crash. The vulnerability is present in the backup metadata handling logic, where the daemon processes the index.yaml file from an imported archive and accesses members of the parsed backup configuration without first verifying that the configuration object was initialized. A malicious or malformed index.yaml that omits the config block causes a nil-pointer dereference during bucket import operations and terminates the daemon. Repeated use of this issue can be used to keep Incus offline, causing a denial of service. This issue is fixed in version 7.0.0.
Weakness: CWE-476
Which versions are affected by CVE-2026-40195?
5 open source packages ship an affected version, including github.com/lxc/incus/v6/cmd/incusd, github.com/lxc/incus and github.com/lxc/incus/v6. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/lxc/incus/v6/cmd/incusd Go | All versions | 7.0.0 |
github.com/lxc/incus/v6/cmd/incusd Go | All versions | 7.0.0 |
github.com/lxc/incus Go | All versions | None |
github.com/lxc/incus/v6 Go | All versions | None |
github.com/lxc/incus/v7 Go | All versions | 7.0.0 |
Products include Linuxcontainers Incus.
How do I fix CVE-2026-40195?
Upgrade github.com/lxc/incus/v6/cmd/incusd to 7.0.0 or later.
Is CVE-2026-40195 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40195 exists.
Other vulnerabilities in lxc incus
- CVE-2026-33897 Incus vulnerable to arbitrary file read and write through pongo templates
- CVE-2026-33945 Abitrary file write through systemd-creds option
- CVE-2026-33898 Local Incus UI web server vulnerable to nuthentication bypass
- CVE-2026-23953 Incus container environment configuration newline injection
- CVE-2026-23954 Incus container image templating arbitrary host file read and write
Sources
Also known as DEBIAN-CVE-2026-40195, GHSA-gc7j-g665-rxr9, GO-2026-5397, UBUNTU-CVE-2026-40195.