CVE-2026-12539

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Source

https://cve.org/CVERecord?id=CVE-2026-12539

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12539.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-12539

Published

2026-06-18T13:51:13.588Z

Modified

2026-07-08T07:23:27.636466728Z

Severity

5.7 (Medium) CVSS_V4 - 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 CVSS Calculator

Summary

Docker Sandboxes ICMP egress restriction bypass after daemon restart

Details

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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12539.json",
    "cna_assigner": "Docker",
    "cwe_ids": [
        "CWE-665",
        "CWE-923"
    ]
}

References

Affected packages

Git / github.com/docker/sbx-releases

Affected ranges

Type

GIT

Repo

https://github.com/docker/sbx-releases

Events

Introduced

Fixed

e4809b108ff941fbd3dc8ab1edd8755af78ddc07

Database specific

{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.14.0"
        },
        {
            "fixed": "0.33.0"
        }
    ]
}

Affected versions

Other

dev-02f174c

dev-1f51dc0

dev-2631810

dev-438ebd7

dev-78ed158

dev-793e764

dev-8fc2763

dev-921c1c7

dev-a5207e0

dev-ad0ca5e

dev-bad9503

dev-c13a59d

dev-c7702ef

dev-dc73246

dev-e54ee33

dev-ebc3fbe

v0.*

v0.16.0

v0.17.0

v0.18.2

v0.18.3

v0.18.4

v0.18.5

v0.18.6

v0.18.7

v0.19.0

v0.20.0

v0.21.0

v0.23.0

v0.24.1

v0.24.2

v0.25.0

v0.26.1

v0.27.0

v0.28.0

v0.28.1

v0.28.1-rc2

v0.28.2

v0.28.3

v0.29.0

v0.29.0-rc1

v0.30.0

v0.30.0-rc1

v0.30.0-rc2

v0.31.0-rc1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12539.json"