{"id":"UBUNTU-CVE-2026-63343","details":"Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a `metadata.yaml` symlink pointing to an arbitrary host path allows an authenticated Incus user to read or overwrite any file on the host as root via the instance metadata API. The `exec-output` and `templates/` paths were patched in a prior release using `Lstat` rejection and `os.OpenRoot` confinement; `metadata.yaml` was not included in either patch and remains exploitable. Version 7.3.0 patches the issue.","modified":"2026-09-02T19:41:09.168650743Z","published":"2026-08-21T15:16:00Z","upstream":["CVE-2026-63343"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-63343"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-63343"},{"type":"REPORT","url":"https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p"},{"type":"REPORT","url":"https://github.com/lxc/incus/pull/3750"}],"affected":[{"package":{"name":"incus","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/incus?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-lxc-incus-dev","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_version":"6.0.0-1ubuntu0.3+esm3","binary_name":"incus"},{"binary_name":"incus-agent","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_name":"incus-client","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_version":"6.0.0-1ubuntu0.3+esm3","binary_name":"incus-migrate"},{"binary_name":"incus-tools","binary_version":"6.0.0-1ubuntu0.3+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63343.json"}},{"package":{"name":"incus","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/incus?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.4-2","6.0.5-8","6.0.5-8ubuntu0.26.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-lxc-incus-dev","binary_version":"6.0.5-8ubuntu0.26.04.1~esm1"},{"binary_version":"6.0.5-8ubuntu0.26.04.1~esm1","binary_name":"incus"},{"binary_name":"incus-agent","binary_version":"6.0.5-8ubuntu0.26.04.1~esm1"},{"binary_name":"incus-base","binary_version":"6.0.5-8ubuntu0.26.04.1~esm1"},{"binary_name":"incus-client","binary_version":"6.0.5-8ubuntu0.26.04.1~esm1"},{"binary_name":"incus-extra","binary_version":"6.0.5-8ubuntu0.26.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63343.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}