Description
Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers within them to run untrusted code. In versions 0.8.2 and prior, Boxlite allows users to configure a timeout for services running inside the virtual machine. When the timeout is triggered, Boxlite sends a signal to kill the process. However, instead of using the uncatchable SIGKILL signal, Boxlite uses the catchable SIGALRM signal. Malicious code running inside the sandbox can exploit this vulnerability to continue running after the timeout is triggered, leading to resource exhaustion within the virtual machine and affecting the availability of the Boxlite service. This issue has been patched via commit 28159fc.
Published: 2026-06-10
Score: 6.5 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

Boxlite sandbox allows users to set a service timeout. The implementation mistakenly uses the catchable SIGALRM instead of the uncatchable SIGKILL when the timeout fires. This is a CWE‑404 vulnerability: improper resource shutdown or release. Malicious code running inside the sandbox can capture or ignore SIGALRM and continue executing after the timeout, leading to prolonged resource usage within the virtual machine.

Affected Systems

Vendor boxlite-ai offers Boxlite. Versions 0.8.2 and earlier are affected.

Risk and Exploitability

The CVSS score of 6.5 indicates moderate severity. EPSS is not available and the vulnerability is not listed in the KEV catalog. Exploitation requires the ability to run code inside the sandbox; an attacker can trigger the timeout bypass by submitting a container that listens for SIGALRM and keeps running. The resulting resource exhaustion can impact the availability of the Boxlite service.

Generated by OpenCVE AI on June 10, 2026 at 23:50 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Update to the latest Boxlite release that incorporates commit 28159fc.
  • Configure resource quotas or limits for each Box to constrain the impact of any over‑running process.
  • Continuously monitor container metrics for processes that persist beyond expected timeouts to detect potential abuse.

Generated by OpenCVE AI on June 10, 2026 at 23:50 UTC.

Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-xjhv-pp2r-6f82 BoxLite has a Timeout Bypass Vulnerability
History

Wed, 10 Jun 2026 22:30:00 +0000

Type Values Removed Values Added
Description Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers within them to run untrusted code. In versions 0.8.2 and prior, Boxlite allows users to configure a timeout for services running inside the virtual machine. When the timeout is triggered, Boxlite sends a signal to kill the process. However, instead of using the uncatchable SIGKILL signal, Boxlite uses the catchable SIGALRM signal. Malicious code running inside the sandbox can exploit this vulnerability to continue running after the timeout is triggered, leading to resource exhaustion within the virtual machine and affecting the availability of the Boxlite service. This issue has been patched via commit 28159fc.
Title BoxLite: Timeout Bypass Vulnerability
Weaknesses CWE-404
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-10T22:20:04.243Z

Reserved: 2026-05-18T22:25:21.258Z

Link: CVE-2026-47213

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-10T23:16:48.323

Modified: 2026-06-10T23:16:48.323

Link: CVE-2026-47213

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-11T00:00:14Z

Weaknesses