CVE-2026-115376

Incus contains an arbitrary file write vulnerability in sftpRecursivePullFile that allows a malicious incus-agent to escape the target directory during incus file pull -r. Attackers with root in a virtual machine can return duplicate entries reported first as symlinks then as files or directories, writing attacker-controlled files such as /etc/shadow on the operator's host.

Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.

Incus contains a missing authorization vulnerability in GET /1.0/operations/{uuid} that lets project-restricted clients read operations in other projects. Attackers holding a restricted certificate and a known operation UUID can retrieve command lines, environment secrets, websocket secrets, and trust enrolment tokens.

Incus from 7.3.0 before 7.5.0 contains a project restriction bypass that allows restricted project users to set block.create_options through volume update, copy, and move operations. Attackers can set the option on a custom volume and trigger a copy or move onto a formatting pool to inject arguments into mkfs executed as root.

Incus 6.0.3 before 6.0.7, 6.6.0 before 7.0.2, and 7.1.0 before 7.5.0 contains an improper authorization vulnerability that allows restricted TLS clients to read storage bucket keys in the default project. Attackers can query the bucket keys endpoints to obtain S3 access and secret keys, then read, modify or delete objects in those buckets.

A restriction bypass vulnerability in Incus allows restricted project users to use pull mode migration via clustered refresh requests. An attacker with instance creation rights can send a refresh migration request for an existing instance, causing the server to open outbound TLS websocket connections and probe reachable services.

Incus 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 write, ultimately resulting in arbitrary command execution on the host. A fix is planned for versions 6.0.6 and 6.21.0.

Incus versions 6.20.0 and below allow a user with the ability to launch a container with a custom YAML configuration (e.g., a member of the 'incus' group) to create an environment variable containing newlines, which can be used to add additional configuration items in the container's lxc.conf. This can allow adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command execution on the host. A fix is planned for versions 6.0.6 and 6.21.0.

Incus before 6.0.7, 6.1.0 before 7.0.2, and 7.1.0 before 7.5.0 contains an arbitrary file write vulnerability that allows malicious migration sources to write host files by planting symlinks in transferred volumes. Attackers can craft rsync or btrfs receive streams with a symlink such as rootfs pointing to the host root, writing files as root for full host compromise.

Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a path traversal vulnerability that allows clients able to create instances to write files on the host. The flaw stems from unvalidated dependent custom volume names in instance backup index.yaml files. Attackers can import a crafted instance backup with ../ sequences in dependent volume names to create root-owned directories with controlled content, leading to full host compromise.