SB2026053014 - Multiple vulnerabilities in boxlite
Published: May 30, 2026 Updated: July 28, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Improper Resource Shutdown or Release (CVE-ID: CVE-2026-47213)
CWE-ID: CWE-404 - Improper Resource Shutdown or Release
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper resource shutdown or release in the execution timeout watcher when handling execution requests with a configured timeout. A remote user can submit code that ignores or catches SIGALRM to cause a denial of service.
The issue occurs because the timeout mechanism sends SIGALRM instead of the uncatchable SIGKILL signal.
2) Path traversal (CVE-ID: CVE-2026-46703)
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to write arbitrary files on the host.
The vulnerability exists due to path traversal in the OCI layer tarball extraction logic in boxlite/src/images/archive/tar.rs when processing a crafted OCI image containing symlink tar entries that point outside the extraction root. A remote attacker can supply a specially crafted OCI image to write arbitrary files on the host.
User interaction is required because a victim must load the malicious image.
3) Improper access control (CVE-ID: CVE-2026-46695)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to modify files on the host that are intended to be mounted as read-only, potentially leading to execute arbitrary code on the host.
The vulnerability exists due to improper access control in the virtiofs read-only mount enforcement in boxlite when running untrusted code inside a sandboxed container with a host directory mounted as read-only. A remote attacker can remount the shared directory in read-write mode and modify host files to modify files on the host that are intended to be mounted as read-only, potentially leading to execute arbitrary code on the host.
The issue stems from boxlite relying on guest-side mount flags for read-only enforcement while granting container capabilities such as CAP_SYS_ADMIN, allowing the guest to remount the share.
Remediation
Install update from vendor's website.