CVE-2026-12539: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-x6hr-f96v-hhgg
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CWE-665
Published
Advisory Summary

CVE-2026-12539 is a MODERATE security vulnerability vulnerability (CWE-665: Improper Initialization) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-12539 at a Glance

CVE Identifier CVE-2026-12539
GHSA Identifier GHSA-x6hr-f96v-hhgg
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-665: Improper Initialization
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-12539

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-12539, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-665: Improper Initialization, where the product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-12539 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12539
docs.docker.com/ai/sandboxes WEB
https://docs.docker.com/ai/sandboxes
Software Release RELEASE
https://github.com/docker/sbx-releases/releases/tag/v0.33.0

Frequently Asked Questions

What is CVE-2026-12539?
CVE-2026-12539 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-665: Improper Initialization.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-12539?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-12539?
CVE-2026-12539 is classified under CWE-665: Improper Initialization (The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.).
How can I check Maven dependencies for CVE-2026-12539?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-x6hr-f96v-hhgg",
  "modified" : "2026-06-18T15:32:02Z",
  "published" : "2026-06-18T15:32:02Z",
  "aliases" : [ "CVE-2026-12539" ],
  "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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-12539"
  }, {
    "type" : "WEB",
    "url" : "https://docs.docker.com/ai/sandboxes"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/docker/sbx-releases/releases/tag/v0.33.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-665" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-18T14:17:22Z"
  }
}