{"id":"CVE-2026-63343","summary":"Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root","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.","aliases":["GHSA-fmjx-5j3g-997p"],"modified":"2026-08-23T03:42:42.356148257Z","published":"2026-08-21T14:53:26.109Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-73"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63343.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63343.json"},{"type":"ADVISORY","url":"https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63343"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lxc/incus","events":[{"introduced":"0"},{"fixed":"90429bf42f08b41c091e799d81465ff24b5cee2b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"7.3.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v7.2.0","v7.0.0","v7.1.0","v6.23.0","v6.22.0","v6.21.0","v6.20.0","v6.19.1","v6.19.0","v6.18.0","v6.17.0","v6.16.0","v6.14.0","v6.15.0","v6.13.0","v6.12.0","v6.11.0","v6.10.1","v6.10.0","v6.9.0","v6.8.0","v6.7.0","v6.6.0","v6.5.0","v6.4.0","v6.3.0","v6.2.0","v6.0.0","v6.1.0","v0.7.0","v0.6.0","v0.5.1","v0.5.0","v0.4.0","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}