Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M
CVE-2026-47213BoxLite: Timeout Bypass Vulnerability
Medium 6.5
In plain English
A medium-severity security flaw in boxlite from boxlite-ai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | boxlite | no fix listed | GHSA-xjhv-pp2r-6f82 |
| PyPI | boxlite | no fix listed | PYSEC-2026-2400 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| boxlite-ai | boxlite | <= 0.8.2 |
Weakness: CWE-404 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H