VULNERABILITY INTELLIGENCE
CVE-2026-12539
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-06-18
Last modified2026-10-26
Description
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.
Weakness classification
- security@docker.com: CWE-665