Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV L L P L N H N N 5.7 .0014 3.8 —
AFFECTED Product Versions Fixed Docker Sandboxes 0.14.0 – —
TIMELINE Jun 17 Reserved by Docker Jun 18 Published (CNA: Docker) Aug 13 RESCORED — CVE-2026-12539 (Docker Sandboxes). CVSS 5.1 → 5.7 (NVD).
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.
| Date | Event | Detail |
|---|---|---|
| June 17, 2026 | Reserved | Reserved by Docker |
| June 18, 2026 | Published | Published (CNA: Docker) |
| August 13, 2026 | RESCORED | RESCORED — CVE-2026-12539 (Docker Sandboxes). CVSS 5.1 → 5.7 (NVD). |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| Docker | Docker Sandboxes | — | 0.14.0 | — |
Authoritative record: CVE-2026-12539 at cve.org
Vendors: docker
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-12539 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.