EUVD-2026-37893
GHSA-x6hr-f96v-hhgg
Severity by source
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
AV:L because exploitation requires code execution inside the sandbox; AC:H maps the daemon-restart prerequisite (AT:P in 4.0); S:C captures the sandbox boundary escape enabling external ICMP traffic.
Primary rating from Vendor (docker).
CVSS VectorVendor: docker
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
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
ICMP egress policy bypass in Docker Sandboxes (sbx) allows untrusted workloads - explicitly including AI agents - to defeat the documented ICMP block and reach arbitrary external hosts after a Docker daemon restart. The authorizer enforcing the ICMP egress restriction is applied only at network-creation time and is never re-applied when the daemon reconstructs network state from disk on restart, leaving the policy unenforced for the lifetime of the rebuilt network. …
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Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two specific conditions to be simultaneously true: first, the Docker daemon must have been restarted after the sandbox network was initially created, since only the restart event triggers the policy gap by causing network reconstruction from disk without re-applying the ICMP authorizer; second, an untrusted workload must be executing inside the sandbox with the ability to open raw sockets or use ICMP - which the sbx threat model treats as an assumed attacker capability. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N) scores 5.7, which accurately reflects the key constraints: local attack vector (workload must already execute inside the sandbox), a specific attack prerequisite (AT:P - the daemon must have restarted after network creation), and low-privilege execution within the sandbox. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An AI agent or other untrusted workload running inside a Docker sandbox detects or waits for a Docker daemon restart event - such as one triggered by a routine host update - after which the ICMP egress authorizer is absent from the reconstructed network. The workload then uses standard raw socket or ICMP library calls to send crafted ICMP echo packets to attacker-controlled external infrastructure, encoding sensitive data (host environment variables, secrets visible inside the sandbox, reconnaissance results) as covert ICMP payloads. … |
| Remediation | Upgrade Docker Sandboxes (sbx) to v0.33.0 or later, which resolves the issue by ensuring ICMP egress remains blocked across daemon restarts, as confirmed in the release notes at https://github.com/docker/sbx-releases/releases/tag/v0.33.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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