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CVE-2026-47213 boxlite-ai CVE debrief

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.

Vendor
boxlite-ai
Product
boxlite
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of Boxlite versions 0.8.2 and prior should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability exists in the Boxlite sandbox service, which uses the catchable SIGALRM signal instead of the uncatchable SIGKILL signal when killing processes after a timeout. This allows malicious code to continue running and cause resource exhaustion.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to a version of Boxlite that uses the SIGKILL signal for killing processes after a timeout.
  • Restrict access to the Boxlite service to trusted users only.
  • Monitor Boxlite service logs for suspicious activity.

Evidence notes

The CVE-2026-47213 vulnerability was patched via commit 28159fc.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47213 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47213

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47213 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47213

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.