CVE-2026-86836: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-x544-76qg-7v6p
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CWE-276
Published
Advisory Summary

CVE-2026-86836 is a HIGH security vulnerability vulnerability (CWE-276: Incorrect Default Permissions) affecting Software libraries in the Maven ecosystem. The weakness occurs when during installation, installed file permissions are set to allow anyone to modify those files.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-86836 at a Glance

CVE Identifier CVE-2026-86836
GHSA Identifier GHSA-x544-76qg-7v6p
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-276: Incorrect Default Permissions
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-86836

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-2026-86836, 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-276: Incorrect Default Permissions, where during installation, installed file permissions are set to allow anyone to modify those files. 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

In Eclipse Ankaios versions 0.1.0 through 1.0.2, the agent creates workload files and Control Interface named pipes (FIFOs) under a predictable path derived from the agent name and a hash of the workload's runtime configuration. If a directory or FIFO already exists at that path when the agent (re)starts, the agent reuses it based only on an existence and/or file-type check, without validating its owner or permissions. A local, unprivileged user with write access to the same base directory (by default under `$TMPDIR/ankaios`, e.g. shared `/tmp`) can pre-create this path hierarchy, including the two Control Interface FIFOs, before the agent starts. The agent then treats the attacker-owned FIFOs as the legitimate Control Interface for the targeted workload. The attacker can complete the Control Interface handshake and issue requests using that workload's configured `controlInterfaceAccess` permissions, allowing impersonation of the workload and, depending on its configured permissions, unauthorized reading and/or modification of the cluster's desired state.

References

NVD — CVE-2026-86836 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86836
Software Source Repository REPOSITORY
https://github.com/eclipse-ankaios/ankaios/pull/799
Software Release RELEASE
https://github.com/eclipse-ankaios/ankaios/releases/tag/v1.0.3
Software Security Information SECURITY
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/280

Frequently Asked Questions

What is CVE-2026-86836?
CVE-2026-86836 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-276: Incorrect Default Permissions.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-86836?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-86836?
CVE-2026-86836 is classified under CWE-276: Incorrect Default Permissions (During installation, installed file permissions are set to allow anyone to modify those files.).
How can I check Maven dependencies for CVE-2026-86836?
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-x544-76qg-7v6p",
  "modified" : "2026-09-15T09:30:31Z",
  "published" : "2026-09-14T18:31:26Z",
  "aliases" : [ "CVE-2026-86836" ],
  "details" : "In Eclipse Ankaios versions 0.1.0 through 1.0.2, the agent creates workload files and Control Interface named pipes (FIFOs) under a predictable path derived from the agent name and a hash of the workload's runtime configuration. If a directory or FIFO already exists at that path when the agent (re)starts, the agent reuses it based only on an existence and/or file-type check, without validating its owner or permissions. A local, unprivileged user with write access to the same base directory (by default under `$TMPDIR/ankaios`, e.g. shared `/tmp`) can pre-create this path hierarchy, including the two Control Interface FIFOs, before the agent starts. The agent then treats the attacker-owned FIFOs as the legitimate Control Interface for the targeted workload. The attacker can complete the Control Interface handshake and issue requests using that workload's configured `controlInterfaceAccess` permissions, allowing impersonation of the workload and, depending on its configured permissions, unauthorized reading and/or modification of the cluster's desired state.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:H/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-2026-86836"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eclipse-ankaios/ankaios/pull/799"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eclipse-ankaios/ankaios/releases/tag/v1.0.3"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/280"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-276" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-14T18:20:20Z"
  }
}