CVE-2026-12539
MEDIUM EPSS 1.0%
Published Jun 18, 20262w ago · Modified Jun 22, 20261w ago
5.7 CVSS 4.0
Published Jun 18, 2026 2w ago
Last Modified Jun 22, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
1.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 2
CWE-665
CWE-923
References 2
- docs.docker.com https://docs.docker.com/ai/sandboxes/
- github.com https://github.com/docker/sbx-releases/releases/tag/v0.33.0
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.