# CVE-2026-40195: GO-2026-5397 - Incus has a Nil-Pointer Dereference Panic via Bucket Metadata in github.com/lxc/incus

Source: https://junglewise.ai/threats/cve-2026-40195-incus-has-a-nil-pointer-dereference-panic-via-bucket-metadata  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-06  
License: CC BY 4.0 with a link back

CVE-2026-40195 · Severity: medium · CVSS 6.5 · Published 2026-05-06

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.

Technologies: [github.com/lxc/incus (Go)](https://junglewise.ai/threats/technologies/github-com-lxc-incus), [github.com/lxc/incus/v6 (Go)](https://junglewise.ai/threats/technologies/github-com-lxc-incus-v6), [github.com/lxc/incus/v6/cmd/incusd (Go)](https://junglewise.ai/threats/technologies/github-com-lxc-incus-v6-cmd-incusd), [github.com/lxc/incus/v7 (Go)](https://junglewise.ai/threats/technologies/github-com-lxc-incus-v7), [Linuxcontainers Incus](https://junglewise.ai/threats/technologies/linuxcontainers-incus). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Linuxcontainers](https://junglewise.ai/threats/vendors/linuxcontainers).

## Quick answers

**Is CVE-2026-40195 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40195 being exploited in the wild.

**How severe is CVE-2026-40195?** Medium severity, with a CVSS score of 6.5, published 6 May 2026.

**Which products and versions are affected?** github.com/lxc/incus (Go) SEMVER:introduced=0; github.com/lxc/incus/v6 (Go) SEMVER:introduced=0; github.com/lxc/incus/v6/cmd/incusd (Go) SEMVER:introduced=0,fixed=7.0.0; github.com/lxc/incus/v7 (Go) SEMVER:introduced=0,fixed=7.0.0.

**Is there a fix for CVE-2026-40195?** Yes. github.com/lxc/incus/v6/cmd/incusd (Go): upgrade to 7.0.0 or later; github.com/lxc/incus/v7 (Go): upgrade to 7.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-40195?** Check whether you run github.com/lxc/incus (Go), github.com/lxc/incus/v6 (Go), github.com/lxc/incus/v6/cmd/incusd (Go) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/lxc/incus/v6/cmd/incusd (Go): upgrade to 7.0.0 or later

  ```sh
  go get github.com/lxc/incus/v6/cmd/incusd@v7.0.0
  ```

- github.com/lxc/incus/v7 (Go): upgrade to 7.0.0 or later

  ```sh
  go get github.com/lxc/incus/v7@v7.0.0
  ```


## Affected products

- github.com/lxc/incus (Go) SEMVER:introduced=0
- github.com/lxc/incus/v6 (Go) SEMVER:introduced=0
- github.com/lxc/incus/v6/cmd/incusd (Go) SEMVER:introduced=0,fixed=7.0.0
- github.com/lxc/incus/v7 (Go) SEMVER:introduced=0,fixed=7.0.0
- Linuxcontainers Incus

## Identifiers

- CVE-2026-40195
- GHSA-gc7j-g665-rxr9
- GO-2026-5397

## Related threats

- [Incus project restriction bypass in instance copy](https://junglewise.ai/threats/cve-2026-55622-incus-project-restriction-bypass-in-instance-copy)
- [Incus authorization bypass in custom volume copy](https://junglewise.ai/threats/cve-2026-55621-incus-authorization-bypass-in-custom-volume-copy)
- [LXC Incus arbitrary file write via image hash path traversal](https://junglewise.ai/threats/cve-2026-48769-lxc-incus-arbitrary-file-write-via-image-hash-path-traversal)
- [LXC Incus nil-pointer dereference in CreateCustomVolumeFromBackup](https://junglewise.ai/threats/cve-2026-48756-lxc-incus-nil-pointer-dereference-in-createcustomvolumefrombackup)
- [LXC Incus argument injection in backup compression algorithm](https://junglewise.ai/threats/cve-2026-48755-lxc-incus-argument-injection-in-backup-compression-algorithm)