CVE-2026-12539

Docker Sandboxes (sbx) blocks ICMP egress with an authorizer applied only at network-creation time, and does not re-apply it to networks rebuilt from disk when the Docker daemon restarts, so a restart-surviving sandbox forwards ICMP to arbitrary hosts. A workload inside a sandbox, which the threat model treats as untrusted, can therefore defeat the documented ICMP egress block to perform network reconnaissance and exfiltrate data over an ICMP covert channel, regardless of the configured allowlist.

CVSS

No CVSS.

References

Link	Resource
https://docs.docker.com/ai/sandboxes/
https://github.com/docker/sbx-releases/releases/tag/v0.33.0

Configurations

No configuration.

History

18 Jun 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-18 14:17

Updated : 2026-06-30 17:16

NVD link : CVE-2026-12539

Mitre link : CVE-2026-12539

CVE.ORG link : CVE-2026-12539

JSON object : View

Products Affected

No product.

CWE

CWE-665

Improper Initialization

CWE-923

Improper Restriction of Communication Channel to Intended Endpoints

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