CVE-2026-12539— Docker Sandboxes ICMP egress restriction bypass after daemon restart
Possible ATT&CK Techniques 2AI
T1046 · Network Service Discovery T1048 · Exfiltration Over Alternative ProtocolAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Docker | Docker Sandboxes | 0.14.0< 0.33.0 | affected |
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I. Basic Information for CVE-2026-12539
Vulnerability Information
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Vulnerability Title
Docker Sandboxes ICMP egress restriction bypass after daemon restart
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通信信道对预期端点的不适当限制
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Docker | Docker Sandboxes | 0.14.0 ~ 0.33.0 | - |
II. Public POCs for CVE-2026-12539
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-12539 (2)
IV. Related Vulnerabilities
Same vendor: Docker
- CVE-2026-12039
Docker Sandboxes network egress allowlist bypass via unfilte - CVE-2026-8936
Unbounded recursion in grpcfuse kernel module allows contain - CVE-2026-5843
Docker Model Runner container-to-host code execution via MLX - CVE-2026-5817
Docker Model Runner container-to-host code execution via uns - CVE-2026-6406
Docker Desktop Enhanced Container Isolation bypass via --use
Same weakness: CWE-923
- CVE-2026-12039
Docker Sandboxes network egress allowlist bypass via unfilte - CVE-2025-36145
Multiple Vulnerabilities in watsonx.data - CVE-2026-22726
Route Services Firewall Bypass - CVE-2025-36180
Inadequate Pod Communication Restrictions, affects watsonx.d - CVE-2026-34205
Home Assistant: Unauthenticated App (Add-on) Endpoints Expos
V. Comments for CVE-2026-12539
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