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Thu, 28 May 2026 16:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Canonical
Canonical multipass |
|
| Vendors & Products |
Canonical
Canonical multipass |
Thu, 28 May 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 28 May 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An issue was discovered in Canonical Multipass before version 1.16.3. The host-side SFTP server component (sshfs_server), which executes with root privileges on the host, contains a path containment bypass vulnerability within its validate_path function in src/sshfs_mount/sftp_server.cpp. The function performs a plain string prefix comparison on requested paths without path separator validation or dot-dot (..) normalization. A local attacker with root privileges inside a guest virtual machine can bypass the FUSE layer by injecting raw SFTP frames (such as an SSH_FXP_OPEN request) directly into the sshfs_server process stdin/stdout pipes via procfs. By supplying a path containing directory traversal sequences that match the allowed mount prefix, the attacker can force the host-side root process to resolve the traversal and open files outside the designated mount boundary. This allows a guest-side user to read arbitrary files on the host filesystem, resulting in a virtual machine escape. | |
| Title | SFTP Server VM Escape in Canonical Multipass | |
| Weaknesses | CWE-22 | |
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: canonical
Published:
Updated: 2026-05-28T14:24:22.829Z
Reserved: 2026-05-28T12:03:02.295Z
Link: CVE-2026-49238
Updated: 2026-05-28T14:24:15.595Z
Status : Received
Published: 2026-05-28T14:16:24.403
Modified: 2026-05-28T16:16:29.973
Link: CVE-2026-49238
No data.
OpenCVE Enrichment
Updated: 2026-05-28T16:30:15Z