CVE-2026-12539
Docker Sandboxes ICMP egress restriction bypass after daemon restart
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-923 CWE-665 |
| Vendor | docker |
| Product | docker sandboxes |
| Ecosystems | |
| Industries | Technology |
| Published | Jun 18, 2026 |
| Last Updated | Jun 18, 2026 |
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Affected Versions
Docker / Docker Sandboxes
0.14.0 < 0.33.0